I think this is a great idea for a Jam. Personally I've needed some drive to get something going and this was an amazing first step... sure my game is pretty terrible but you know what? I got it done and submitted - for me, and I bet some others out there, that is a win -.
What I find more disrespectful is making an anonymous account to post a negative comment and then disappear.... of course maybe I'm wrong but that's sure how it looks from this side of things.