Till now there is no BT client which allows you to pre-check if the torrent is corrupt or not.You'll mainly need to rely only on the comments posted by the site's members which again puts up the question of how genuine the members are.If you check torrentspy users most of them just bluff without reason that a torrent is bogus even though they haven't even downloaded it.

I discretely like Demonoid in this aspect as it has a good class of users & regulated the site pretty well with it's moderation style.So you'll rarely find any corrupt files out there.