TTT is great, on any platform. Yes it was short, but there were interesting extras for fans to earn (by levelling up to ten) which STILL didn't take very long. It would have been better if they'd bundled all three into one game...though that would make less profit eh.
I enjoyed the ROTK game, it is short like other people have said, but it is fun for the short time you play it. Something that really craps me off about it is that, the first time you play a mission you cant skip the movies. I've read the books and seen the movie, i dont really want to see them but you have to sit through them.