I just got back from the movies after seeing this and, I felt pretty awesome after seeing it. It was actually alot of better than I thought it would be, and the fight scenes were pretty awesome, especially the one were Po was trying to get the dumpling from the mouse guy(Can't spell his name) training him to be the dragon warrior.
They were thinking pretty creatively when they were doing the fight scenes, more so than I would of expected, seeing as how so many movies seem utterly uncreative, even when animated. The bridge fight was great, especially when the tigress gets knocked so hard she breaks the boards on the bridge.
The only problem was(I'm putting this all in spoilers) the furious 5 didn't have much to do with how the story is told. They just seemed kind of there, rather than being major characters. They're pretty much foils to Po. They did have a lot to do with the story, just not the actual movie.
Also, Jackie Chan only having like 3 lines was pretty disappointing. He was the monkey! They couldn't give a talking monkey, VOICED BY JACKIE FRUCPLING CHAN, more lines? He didn't even say anything funny. This leaves me to the assumption that they couldn't pay him enough to do more voice acting, so they had to cut a lot of his lines..
All in all, I'd give it a 4.5/5 Jacksons. The art direction was great, the CG was gorgeous, the voices(Most notably Jack Black's) were very convincing, and the writting was pretty good too. Aside from the things I pointed out, I would of given it a 5.
Also also, when the called Po the dragon warrior, I kept thinking of the game Dragon Warrior, or rather, Dragon Quest, because Dragon Warrior was it's US name..