Fenway flat out sucks. Many seats with completely obstructed views, every step having a different height. It's got history and a gimmick (the monster) that make everyone love it, but to me even the monster lost some appeal once they put seats on top of it.
Plus the people there tend to be idiots. I've been to plenty of pro sports in all kinds of cities and Fenway is the one spot I've seen with regular fights breaking out between home and away team fans.