I had a rather easy time with Scorpion........... Just do the teleport punch...then his 4 hit combo....then teleport away again.....repeat to beat Kintaro. With Kahn, same thing........until he starts swinging his hammer. Just dodge it until he's done......walk BEHIND him and do your little spear dance. Takes away so much of his health it's not even funny. If you do it in front of him he blocks most of the hits.....but behind him, every hit connects.
I'm thinking about making my wife trade controllers with me for the last fight.......letting me be Scorpion so we can do it just as before. She runs around the outside, doing no offense.....just avoiding getting hit while I mess them up as Scorpion.