To many glitches/bugs...
Also after trying to kill Kiro for 20 times or so i give up, being force'd to watch the cutscene everytime is just pure pain...
Had to redo all levels and take all stars 4 times before i got the Rolling stone badge, also got kinda anoy'ed over the bugg with the knife not cuting like other people mentioned. Except for those things this was a great game.