As for the ROTS game...IGN gave it a 4.5. I give it a 8.75. It's amazing. They completely ripped into it, but they are just jaded and hate Star Wars. There is nothing cooler than fighting Obi-Wan as Anakin and grabbing things in the room to throw into him before you launch him into the air with your lightsaber, slash him a dozen times before he lands, and then come down with the blade buried into his chest.
Or force grabbing a Jedi youngling, and "forcing them" to fly and impale themself onto your blade.
Seriously, the game rocks. And as for spoilers...most of the levels are scenes from the book or that were cut from the movie. There really isn't that much spoilering about it. I think it spoils it as much as the Lord of the Rings games spoiled the movies.