Wrigley was cool as an atmosphere, and It was a Ball Park I always wanted to attend, but the seats are pretty uncomfortable and the "obstructed views" are absurdly annoying. I think if you are a true baseball fan, the park is a must attend at least once, the atmosphere inside and around the park is awesome, very similar to Fenway.
Fenway, as a Sox fan I like it, but the seats do suck, and again, like Wrigley, obstructed view seats are annoying.
I somewhat disagree about Camden yards though, I've attended games there more than any other park and I really like the place. Now around the stadium is a s***-hole and Baltimore needs to fix the crime and corruptness of the city, but inside the stadium itself is beautiful, nice seating, pretty good food, they let you bring food and drinks inside the stadium (even alcohol as long as it is sealed and not glass) and the staff have been pretty cool to me. I got free tickets in the upper deck at a game this season from a friend, and when I went to sit in my seat, the usher was like "you know what? there is no one here, why don't you guys just sit down the first base line, you'll enjoy it more, and radioed down and let us have awesome seats. My only bad experience there was the riot game a few years ago, and to be fair that was a REALLY bad experience. So inside the stadium - great, around the stadium - bad.
Only other parks I've been to I didn't see on the List (Phillies and Nationals).