Gateway Paintball Park, Bridgeton - Gateway has some nice field setups such as mounds. they also have a Sup air field, which wacky doesn't at the moment. Gateway also holds tournaments.
Wacky was the first place I had started playing paintball. I do like some of their courses such as Village and their wooded fields. The staging area is sufficient, they have a covered pavillion in which you can set up your gear without fear of the weather. The refs are ok, I haven't had a problem with them. Some of the people that come for open play can be real pains, however. There's only one incident that I witnessed with bad sportsmanship, but that's another story. The field paint and guns are adequate for the "once-in-a-while player" Tippman 98C and A5's with $75 for a case of paint. (Can't remember which brand though. They had recently switched from Nitroduck)