the white sox announcer (Hawk) is notorious for being a homer, and it drives plenty of baseball fans bonkers.
I grew up with it, and I don't mind it (I can understand why people don't like it). Hawk can be annoying (especially when there is a call he feels is bad, he will bitch about it for innings), but i prefer to listen to a baseball game with an announcer that seems to actually give a crap about the team instead of just someone trying to do their best to say what is going on.
As for if other teams broadcasters are like it (aka they are clearly rooting for the team they are broadcasting for), some are (but not nearly as homery as Hawk is) and I enjoy those... some sound like they are just reading a script about what is going on... and I find those broadcasts really boring. (some also do a job like what you said... mostly straightforward but will root for their team in exciting moments)