I saw this movie.
It was great!
I enjoyed all the humor. I enjoyed all the action. I enjoyed all the kung fu movie references both gross and subtle.
And yes I thought it would suck.
Yep I have to say I pretty much mirror this opinion.
I though it would suck (like natcho libera(SP) level suck) and it was actually enjoyable, particularly if you enjoy martial arts movies. The humor was well above that of a typical Jack Black movie and the casting was excellent for all the characters. Lots of good actors adding their voices to humorous effect.
I wouldn't go so far to say 5 out of 5 but it is good enough that I'd consider picking it up when it comes out if I can get it on sale.