Ten-Bob Dylan holds the opinion that when people describe a movie as pretentious it almost always means that the reviewer didn't get it and that, as such, pretentious is useless as a critical description.
If nothing else it's an idea that stops you from using it without thinking, at least a bit, about whether the word is appropriate.
Well, I watched Stay and a bigger load of pretentious twaddle I couldn't imagine. It's Jacob's Ladder with pretentions to Mulholland Drive, but so wholly worried with how the next scene transition is going to be achieved that everything else seems secondary. It doesn't help that Ewan McGregor seems to act even less here than he did in Phantom Menace, being content to look mildly confused while wearing yellow trousers, which were, no doubt, significant of something.