I think SoT is a very mediocre game, the combat is slow and sticky, the camera is often atrocious, the difficulty curve is weird, the controls not so accurate and the story, while ok, failed to really grab me. WW certainly had better gameplay, and rock music doesn't cause me an allergic shock like some people here, so I can say I enjoyed it more. As for Two Thrones, I never played it.
My favorite has got to be the new PoP game though. The combat is braindead and could use some improvement certainly, but the game is vibrant, colourful, open ended, the massive wastelands give it an epic feeling, the platforming is the best and most fluid yet and it feels really satisfying, and I loved both its humour and its dark ending. There is real potential for greatness if they fix the combat and continue the story from where it left off.