Let's get to the negative part first. It's slow. Reeeally slow. The main character is very unsure and often misses good chances to improve himself. But it's also a strenght of this manga. (From now on watch out for spoilers)
He's got only a friend at the start of the story, and as of chapter 51, he's pretty much in the same situation. But that's far better than a sudden change of lifestyle that would make this manga really cliche and uninteresting (how many times have we seen a supposedly loser character turn into a popular one in a matter of seconds, to the point that we can't even tell why he was a loner to begin with?). And there is character development: it's slow paced, so it's not for everyone, but it makes it more enjoyable to me. The main character is not improving in his actions, but he's surely and gradually understanding what he has to change about himself. It's not that his flaws are ignored by the mangaka (that would make it annoying): the MC is the first to point them out.
You won't believe it, but I consider this manga really original for many reasons:
-Instead of having the MC struggling to understand his feelings, he's the one who is most sure about them, way more than the main heroine (it's the whole issue of the manga after all)
-We usually have a character who isn't able to spit out what he feels, so he does it through actions; our main here is the opposite, he's actually confessed countless times (to the same girl), but he can't bring himself to take the initiative
-If the MCs are supposed to be a bit awkward in this kind of manga, then why exactly do all the girls end up swooning over them almost immediately? Well, this main character has regular interactions with 3 cute girls and an older one, and none of them sees him as a love interest (even his crush); not only that, but they most likely won't ever (except the main heroine of course)
-There is character development for the side characters too! Actually a little flaw is that the main couple's friends get even more development than the "heroes" themselves; but it's logical if you think about their personalities, and it actually serves the purpose to balance the slow pace and prevent the manga from getting boring
-While the MC is head over heels in love, he is in love with the actual person, not her curves (an otaku who's not a pervert, who would have said); he actually cares about stuff like his crush's future career, and he's also interested in his best friend's issues
In the end we have a slow series with likeable characters and a good-for-nothing protagonist who is struggling to change, and for once can't do it by snapping his fingers. If given its time, this manga could bring a really well done character development. We'll see; for now, I'd recommend this if you have the patience to wait for the characters to mature, because I'm sure they will.