Heck, as you said, some "new" sets do work. However if it doesn't, isn't that the best way to figure out what works and what doesn't? Like you said, "There's no substitute for experience."
Right. So use whatever Pokemon you want, we don't care. If you aren't experienced, however, it isn't your place -yet- to be helping other people. If you want to learn, this place is a great place. If you don't, A) what are you doing here or alternatively B) why are you fucking with us? We don't need people who have no clue what they are doing trying to teach other people, which is why we tend to shoot those people down or restrict them to one topic until they actually learn the fundamentals of the game.
New sets are hardly trashed unless they don't have a clear rationale behind them that makes sense. If you don't actually like spending more than 2 minutes on a post this probably isn't the best forum...
But anyway, I agree with the rest of your post. People don't really understand what goes on here unless they are really internet-experienced or have come from another forum that doesn't tolerate this kind of shit. Because of this, there tends to be a rift between sites like this and other, more general sites like Serebii. We don't want everyone from Serebii to come here, only those that are interested in the community or competitive battling. People sign up here and expect another general Pokemon forum with the exact same rules... what's the point? I hate redundancy. This site fills one specific niche and tries to do it as best as possible.