This article reads like the author kind of liked the movie, but their editor changed the headline:

Naturally, the premise sounds silly. Foolish, even. But Seinfeld doesn’t let it show. Unfrosted is briskly paced, gamely acted, and its script, co-written by Spike Feresten, Andy Robin, and Barry Marder, does not contain a whit of self-consciousness. It’s also funny at times, even if it is a depressing, vulgar little project.