I was looking forward to this, so I decided to watch my two favourite (and only) Gilliam DVDs, 12 Monkeys and Brazil. 12 Monkeys was still good, but the twist is nowhere near as revolutionary as I'd somehow memorised it. But I liked Bruce Willis and Madeleine Stowe, and it had some nice ideas and imagery. But crucially, the imagery was married to a coherent plot. Whereas Brazil sorely lacks this. Visually, it's nice (but not unbelievable), but it just makes very little sense. Which I can normally enjoy (most Lynch films, some Cronenbergs and recent films like Synecdoche New York which I didn't understand but loved), but here it just made the film tedious. I'm not sure how I ever really enjoyed it.
So, coupled with the recent terrible reviews of Parnassus I won't be seeing the new film!
I also watched Monty Python's Holy Grail at the cinema recently, and it had its funny moments, but it had plenty of very unfunny moments too.
This is a pretty negative first reply, I'm sorry (especially seen as I haven't watched the film), but I'd be interested to hear what others think about Gilliam films.