Baby Steps is a great sports manga. That is, if you're only in it for the sports, and not for say, likable characters or drama between them.
Most sports mangas barely even focus on the actual sport, and crank the action up to eleven when they do. It's not about the accuracy of the sport, but it's about the drama of the player, and how their sad little emo back story gives them the will to go through and reach the top.
None of that is in Baby Steps. No drama, thank god. Of course, the drama is what makes a lot of people like sports mangas period, so these people will probably, almost certainly, not like Baby Steps.
I wouldn't compare Baby Steps to Prince of Tennis. POT is one of those 'drama' sports, which cranks up the tennis to eleven, and the further it goes, the more unrealistic it becomes. The story could have picked out any sport and it would still have been the same. Not true for Baby Steps. It's very calculating, smart, and most importantly real. It's about tennis.
The main character is not your typical idiot hero, nor the genius prodigy who excels in everything he touches. No, Ei-chan is someone who's so devoid of any talent, that he's only good at being average or 'good' at whatever he does, but he's not the best or a genius, or excels at something in particular. No, that takes actual effort and training.
No curb stomp battles here, tennis is real and the main character loses quite a bit of matches. Of course he does, he only started playing tennis for a few months, despite his ability to be good all-around (but not anything specific), he still loses quite a bit because he doesn't have anything he's really good at. This is frequently mentioned in the manga, where he's an alright tennis player, he doesn't have any definitive moves, or finishing moves.
About his personality, well he's like an obsessed data miner, and writes everything down in his notebooks. He has big eyes that are always wide open in shock, surprise, or simply from amazement. There's not much to the guy. Really, there isn't.
Any other character doesn't get enough screen time to show their personality, or backgrounds or whatever, just long enough to introduce them to the reader as they have another tennis battle.
Oh, despite what it says as a romantic subplot, that's like saying Naruto has a romantic subplot. I don't even know why they bother with it, because it's so casually mentioned in like a page or two, you wonder if it has any point to it at all.
So yeah, Baby Steps is about tennis. Not about the drama, not about overcoming the battle despite all odds, or about interesting characters, but just tennis.
I personally like it.