The first kfp film was the first Dreamworks movie I genuinely liked. Paying a lot of respect to eastern philosophy and martial arts, the film boasted a likeable cast and some really impressive action scenes. I loved the plot in spite of it being loaded with overused martial arts film tropes. It managed to make me like Jack Black.
Then the sequel came out and...I liked it more than the original. It was darker, funnier, had (arguably) better action and a villain who wasn't a retread of tai lung. It had strong continuity from the first, which is greatly appreciated.
Then there was the tv series. It was ok but it messed with continuity too often. And it was pretty insulting towards master tigress, often making...somewhat offensive jokes at her expense.
Then the third movie came and went with a whimper. I liked the soundtrack, and how master tigress got some subtle character development. Gone is the ice queen from the first, and she seems...happy. When she hugs po, neither are surprised.
My favorite moment in the franchise is when Po learns of what happened to his village in kfp2.
Oh yeah any member of the furious five that isn't Tigress is fairly insignificant to the overall plot.