I personally don't hate sasuke. But i can reason to why people would. What i can't reason to is why people kiss the ground he walks on. Naruto can be somewhat seen as a tool, but remember ultimately he decides what he wants. He decides to show mercy on enemies, he decides to try harder and to impress everyone, he paves his own road. Sure there are more people to help him than sasuke rather than use him, but ultimately naruto possesses a power he can abuse an exploit but he decides to become someone people can admire.
Sai, as you said, is a tool, literally, but it is when he gained his own will to show mercy that you can really see him starting to change, to open up. I believe sai is what the mangaka wanted to do with sasuke, show him gain more emotions and become more human, but ultimately that would ruin the sasuke plot.
Sasuke on the other hand gets the promise of power dangled in front of him, his vengeful nature exploited, and his abilities used for the profit of others. Is it for a nation? no. Is it for friends? no. Is it at least for the same person? No. He gets used by a variation of different people, tossed around until he finally wises up and gets even.
Remember, the difference between a tool and a soldier is loyalty. Sai and naruto have their loyalties prioritized, it's to their friends. Sasuke's loyalty lies in his goal, and because of this he is blind to the people who exploit it.
Now, you bring up the uchiha-girl rant. Some of the things she says is fine, and yet some of the things she says, i think she's on crack.
http://uchiha-girl.deviantart.com/art/Why-Must-Everyone-Hate-Sa suke-5705550To begin, he's lonely, betrayed, etc.....yet he's popular and desired by all the girls. He's of the uchiha blood, so he's naturally skilled (to a degree) and he is respected if not envied by all the guys. This in itself is completely retarded! He's lonely, but he has girls dangling off of her. I don't give a damn if uchiha-girl would go crazy from being oggled by fans, but she seems to forget they give a feeling of importance. Sasuke isn't lonely because he was betrayed, sasuke is lonely because he DECIDED to be alone, that he decided to shun everyone. He is the complete opposite of naruto (which is what he was supposed to be), a person who starts with popularity and acceptance and abandons it (whereas naruto is zero to hero). In short, he was DESIGNED to be hated, and if not so strongly hated, he was designed to be the enemy, the darker path that naruto could've taken.
The portion she writes about itachi, she obviously didn't reach the part where itachi was basically redeemed. That yes, although he made the mistake of being used, he is trying to rectify it and even gave sasuke the opportunity to achieve what others will never have, his eyes (the sharingan that won't go blind), but sasuke didn't even take it. Itachi was redeemed, sasuke still hasn't been. In fact, even now that his goal has been met, he's still digging himself a grave.
Uchiha then starts listing what people dislike about him, and counter points, 1 - All the girls want him -. I am assuming uchiha-girl is a girl, and if so she probably wouldn't understand why some males envy him and in turn hate him for it, but i also know of some girls who can't stand shoujo mangas simply because the moderate or normal girl gets a harem of guys. Still, what makes my laugh the most is that she has the audacity to say "And one last thing, you do realize that you’re jealous of an anime character, right?". I mean...UCHIHA-GIRL, writing a SASUKE DEFENSE RANT, is MAKING FUN OF PEOPLE FOR BEING JEALOUS OF AN ANIME CHARACTER!?!?!? For heaven's sakes, what i should be writing in response is "you do realize you're defending and basically in love wiht an anime character, right?". But it's all right, because their situation is SUPPOSED to be enviable! Mangas, animes, and stories in general are ENVIABLE! Who doesn't want to be a hero, who doesn't want to be surrounded by girls, who doesn't want to be a no-good whimp who does nothing but has girls fall for him? It doesn't matter if it is real or fake, the situation is simply enviable!! You are simply jealous of their situation, whether it is real or not! That is one of the oohs and awes of shounen mangas, that by the end of the day, you are filled with so much awe, so much epicness that you say "i wish i was him" or "i wish i could do that".
her second point is valid. He starts off a bit strong, but ultimately they all meet their match and have to evolve. What (who) pisses me off the most, a naruto character that i can say i dislike is sakura. She's not that pretty, she's not even tsundere (she's just a fanboy, literally) and her battles always suck. As for sasuke, you don't see him train, and as a prodigy he'll be a fast learner, but he sitll works.
"3 - He doesn’t acknowledge/respect his teammates because he’s an arrogant, egotistical, asshole -". She beings by saying sasuke acknowledges everyone, just in a different way. It's true, and this different way is that naruto and sakura are not his teammates, they are his peons. It is the acknowledgement that they are a notch or two below him, an arrogant attitude that gets blown out of the water when his chidori's power is compared to naruto's ransengan on the rooftop of the hospital. This is literally the turning point where he realizes they are his equal, and it scares him and disgusts him. It is the reason why he leaves, the realization that he hasn't been improving as much as the people around him, that he isn't above the rest like he thought he was. In short, once again he was designed to be disliked, but i don't blame him, it's a plot thing.
"4 - He willingly betrayed Konoha and went with the Sound ninjas - " not much more to say. It's a plot thing. But don't defend him by saying "MY GOD PEOPLE! IS SASUKE’S LIFE NOT ANGSTY ENOUGH FOR YOU?! (I’m so close to convulsing out of anger it’s not even funny)", because it really isn't. No matter how bad his past is, a few years of not so much as seeing his brother, and surrounded by people who want his acknowledgement, it really isn't. there are plenty of people who have a worse life than his (IN REAL LIFE) that end up as better people. But like i said, it's a plot thing.
"So you see, Sasuke isn’t particularly meaning to be so hateable, he’s just living with a one-track mind. At the end of that track is one thing: Him killing Itachi and the revival of the Uchiha clan. He has no room for friends or distractions, all he wants is to get stronger (which I may add is Naruto’s goal as well.), and let’s face it people, the series wouldn’t be complete without him. He is the main antagonist after all, and if a story only had protagonists, we’d be in for one dull ride."
It's that one track mind that makes him so well hated. A person who stares at the sky will not see the flowers around him. A person who admires the flowers around him will not know the endless sky above. But sasuke, he isn't any of these. Sasuke is the tunneled-vision horse who's being led along a path, a tool who cannot see what he has, what he gets time and time again, and all for what? Ultimately nothing. He is a person who is given things time and time again just to toss them aside, a character that is MEANT to be hated (but i really don't. I can see why people do, but i think the dark tones are kinda cool) so that he can be sacrificed as a shakespearean tragic hero. Ultimately, his life, his mass hatred by the fans, and his actions are all what the author intended.
Ps. for those who don't know what makes up a shakespearean tragic hero, they are typically a person who is admirable, who falls and becomes hated, but upon his death or near his death, he redeems himself in some way. A good example is macbeth, who although his (wife's) ambition causes him to be a terrible tyrant, ultimately at the end he redeems himself a bit.