@raaman can you please clarify your question a little more? No site or forum is perfect, so there will be something wrong in some way with any forum. What did you have in mind?
It is not clear whether the OP is talking about specific forums or promotion forums (webmaster forums) in general. If you want you can point out flaws in almost anything.
I think he is talking about if using promotion forums to promote your forum is good or bad. I think it is not good. It is all about people helping each other to push their forums forward.