I hired it a while ago, and at the time it was by far the worst movie I'd seen since The Big Hit.
I too had heard it was a must see, and an off-beat movie you had too watch when in a silly mood, but it frustrated the absolute crap out of me.
People have also said (like some have mentioned in the thread) that you should watch it twice. I dunno about that. I didn't like The Castle the first time I saw it but loved it second time around, but I just can't see me liking Napoleon in the same way.
BTW worst movie I've seen since ND is Hitchikers Guide to the Galaxy. It is now the clear winner. Was well looking forward to seeing it, then I did. Horrible.