The only people you find complaining on Bitcointalk for the most part are competitors or known trolls like Entropy, Bicknellski, etc...
To answer your question though: No there is nothing valid they bring to the table that qualifies as a scam. Just angry butt hurt trolls who can't stand the fact that all their idiotic "predictions" and false claims turned out to be lies and they are exposed for what they are. So they try to flood the threads and forum with more junk in hopes that people will forget.
Respectfully, you've been just as guilty of that. It's been a very eye opening thread, to say the least.
I have no dog in this fight, just wish there could be some sort of dialogue..."hey, this is what you've done wrong, and here is the evidence" and counters of "We haven't been perfect, and here's how we're working to improve."
Name calling doesn't restore BTC or help reputations.