First: the old remodeled Yankee Stadium
Most Recent: Hartford Civic Center
Best: Subject to taste, but I'm partial to the old baseball parks; so that's Fenway, Wrigley (with the bar underneath the stands) a close second. In Boston, walk the street, get a sausage and peppers, go into the stadium proper on the first base side, get a Guiness and walk back into history. (Plus, side bar: my daughter was diagnosed with a serious milk allergy at about 18 months or so; we used to have to take her in for monthly and/or quarterly checkups. One check up the nurse wasn't getting the readings she expected. Long story short (too bad it's a good story) she "grew out of it" (my words) and her first "dairy" was a sundae out of a mini batting helmet at Fenway, sitting on the ground leaning up against one of those sickly green iron girders inside.)
Worst: I don't know; probably Hartford Civic Center, if you don't count the old Uconn Hockey Rink, which had no walls and so was open to the cold. We would play pickup at 1, 2 am in Storrs, which is to say FUCKING COLD. I'm not a huge fan of the new corporate parks where you can basically walk around and not even realize there's a game going on. Defeats the purpose for me.
Embarrassingly, I've never seen a game in the OLD Boston Garden. One of my regerts.