@caryatid said in criticism not allowed in ad threads is only enforcing a false positive, prove me wrong:
On another forum I visited regularly before it died, they had an advertisement section, with ads locked only to the person who posted the ad, and then a reviews section, where people could throw up posts about their experience on games. It was not a no holds barred section of the forum, there were still civil rules of engagement expected, but you could bring in the positive and the negative there.
It might be a decent option.
If it's the forum I think it was (hi Pern), that review forum pretty much never got used. (Granted, the entire forum never got used for several years, but...)
I don't care much for the idea of locking ads once they're posted. I like seeing bumps, and have bumped ads myself if I play somewhere.
As for the "absolutely no negativity" caveat... I think there maybe ought to be a "then no posts saying how awesome the place is, either." The ads should be just that: ads. No "I LOVE IT HERE, TOO!!" from players. Game-runners can post ads, bump their own threads with updates, etc., and all discussion goes elsewhere.
Otherwise, it's absolutely just an echo chamber.