I'm watching it now and it actually isn't too bad. in the beginning, watching it was an exasperating, anxiety-ridden experience, but it's getting better amidst scattered homages to old german expressionism and hitchcock stuff. simon pegg was made for roles like this. there is actually a really genuine emotional core to this that is pretty much its saving grace whenever it starts to get too slow. don't go in looking for a comedy, but this has surprised me so far.
EDIT: if you weren't initially intending to watch this movie and aren't scared of spoilers, watch this beautiful scene and tell me what you think! you might even convince yourself to go watch it