I wish I’d read Biffo’s blog before going to the cinema:

Ignore all these 4/5 reviews telling us not to worry that they might’ve ballsed it up – they have ballsed it up. It’s really, really, really average. And it feels hollow – unlike the series, you can almost hear the air whistling between the gags; it’s not four episodes rolled into one. It’s two, maybe two and a half episodes, stretched out to the length of four.

That’s it exactly. I think it’s maybe the Cartoon Curse: what works in quickfire episodes doesn’t stretch to an hour-plus. Same way some acts are singles bands who can’t stretch their talents to an entire album.
Mind you, I’m still in a “don’t make me think, entertain me dammit!” frame of mind, and I quite fancy seeing Transformers as a result. Is it the big, dumb, fast, noisy pile of crap it seems to be? And if so, is it a big, dumb, fast, noisy pile of crap *in a good way*?