I've been to over a hundred as well, and my seats are in the infield grandstand (section 24). They're good seats, though you have to be careful about the poles. Only a small amount of LF is obstructed from my seats, but other ones are a lot worse.
I went to Futures at Fenway today and explored some more seats. I went to the upper bleachers and was actually surprised; I thought I would hate them but they're not bad. Spud is right that you can't see all of the action, but you can see most of it and it's a nice view of the park.