We've had three paintball episodes, and they've probably been the best three episodes of the show, in my book. Why would a fourth one be totally awful?
Well, there's a dominant trend in the "more paintball 4ever" direction in the fandom, and the lack thereof in the 3rd season would support what I said, they couldn't think of another hook to hang paintball on. Exactly what Khanada said-genrewise, I'm not sure what else they could do, and evidently neither could the Community braintrust. If they come up with a great hook, great, I'd be the first to praise the ep, but I'm really uncertain what else they could plumb out of it.