Posting in altcoin threads is tricky now. The ones that I'd like to bump - I don't have much to say about them that hasn't been already said so I would sound like a spammer. The ones that I'd like to criticize - I don't want to bump them.
I think criticizing them is valid and even though you have significant bumping power your post provides the thread with only the minimum bumping power the you can generate. Also, I don't see anything wrong with bumping a thread that you feel needs to be criticized, it'll give exposure to the fact that you feel it's a shady project. Just my opinion.