Based on the ones I've been to this year. As of now here's the list (of 3)
1) ATT Park- San Francisco
2) Coors Field- Denver
3) Turner Field- Atlanta
ATT Park is awesome. Even though the team sucks, they had a nice crowd. Food was great, the bleacher seats were comfortable and not 2 miles from the plate and the cost of a ticket wasn't back-breaking. The view of McCovey's Cove is nice.
Coors Field is a place I've been 2 times prior and I like it as well. I was trying to go to the Nuggets game that day, but didn't want to pay $60+ for a game I don't generally like (NBA). Beers of the World is overpriced, but to be expected at a ballpark. I bought $35 seats which were located about 24 row behing home plate (great view). the ballpark itself is nice and situated near the bar scene.
Turner Field is a place I've been at least a couple dozen times. In my younger days we'd buy a cheap ticket and sit in the RF bar area. The food is average at best, beer is overpriced (unless you hit the RF bar- Chop House), and the seats aren't the greatest unless you buy lower level between 1st and 3rd base. It has a generic feel about it.
I plan on making at least 4 more ballpark stops this year. For the millions that follow this blog I'll keep you up to date.