I tend to just take Jackie Chan movies for what they are - a fun watch with lots of cool martial arts but never really much there when it comes to dialogue or plot. But this movie. Whoa. Seriously, I couldn't believe some of the lines that came out of people mouths. And the "physical comedy" of the poor comic relief guy just made me cringe in sympathy every time. There is also a bizarre heavy-handed, yet inconsistent, use of slow-mo throughout it.
When the movie ends you're left feeling frustrated confused and oddly angry. And I think it's supposed to be a comedy - it's labeled as such anyway.
All in all, I think it would make a pretty good candidate for "How Did This Get Made", I think that's probably the only way I'd feel better about having watched it.