Gahhh, still need to see MirrorMask. Repo! was totally ridiculous and I gave up halfway through the first time I watched it. But then it was so darn catchy that I HAD to know how it ended so I ended up watching it again, all the way through. I'd recommend it the same way I'd recommend Rocky Horror--watch it just to say that you have, and then let it go
I freaking love Kung Fu Hustle, because it's 200% more funny if you actually understand Cantonese.
The one movie that I love and that I recommend to nearly everyone I meet is Hedwig and the Angry Inch. I also recently watched a Hong Kong comedy, All's Well that Ends Well 2010, that was pretty hilarious, but only if you understood Cantonese, since the English subtitles were, in my opinion, a pretty huge botch.