I think that you should be able to point stuff out which is wrong with the mod, and suggestions and stuff which you think could be better, BUT if it is an unsponsored unpaid mod then you CAN'T just say "Oh, you're mod is a F***ing Sh!++y little piece of crap, and you might as well use it as an excuse for mucking up your game and reinstalling it rather than actually playing the damn thing!". In fact, you should never insult a mod in any way without using evidence to back it up. Actually, you shouldn't insult a mod at all, but complaining is OK as long as, like I said earlier, you use evidence of what's wrong with it to back it up.