Overall KFP was a good movie. Jack Black has some great lines that had me laughing out loud a time or two. My boys seemed to enjoy the movie and have continued their own Kung Fu fighting re-enactments for a couple days now. My only negative reaction is that 91 minutes of martial arts is tough for me to tolerate. 91 minutes of ANIMATED martial arts was grueling. So while I enjoyed the laughs, I was ready for the movie to end.
I'd recommend this to a friend with kids. For someone without kids, wait for video.