Wrigley's OK - it's kinda a dump right now because previous ownership didn't put any money into it and they literally had concrete chunks falling on fans. The neighborhood is the best part of Wrigley, IMO.
Fenway is the best park in baseball when you factor out comfort. It's IMO much more "oh my god this is God's game" beauty than Wrigley.
I've been to every MLB stadium except the new Miami one. I rank the top few as:
1) Fenway (BOS) - I try to take my bias out too, unless you are behind a pole or in a section that you have to turn to see home it can't be beat. If you have those issues though you'll probably hate life for a few hours
2) PacBell/Oracle (SF) - It's about perfect. And concessions-wise it's very unique.
3) PNC (PIT) - Too bad the franchise with the worst ownership in pro sports play there
4) PetCo (SD)
5) Dodger Stadium (LAD)
6) Wrigley (CHC)
7) Target Field (MIN)
8) Camden Yards (BAL)
9) Kauffman (KC)
10) Coors Field (DEN)