Complaining about what others post doesn't get you very far in a public discussion forum. Everyone has the right to post what they want, as long as they're following basic guidelines dealing with respect. As the conventional wisdom goes, if you don't like what's being posted, no one is forcing you to read it.
There has been, and there continues to be, a great deal of good discussion and quality content posted here. However, you're not going to like every post. Other contributors here may annoy you, disagree with you, or otherwise not meet your desired level of post quality. And you should still respect their right to participate in this public community.
Granted, some of the bantering here could understandably be frustrating, especially for the occasional reader. Most of us are always open to constructive criticism, so please do voice your frustrations in a positive way. After all, we do want new (and existing!) members to feel welcome and enjoy their time here. Popping in to drop criticism into a random thread solves nothing. I'll repeat what Terp wisely said: if you're not part of the solution, you're part of the problem.
A cool head and a mild appreciation of dry humor can be helpful here. Wit and a bit of silliness, especially from Terp, is a deeply entrenched tradition. We're discussing an amusement park, after all. There are plenty of other places in life for seriousness and frustration.