I was putzin' around Costco's game section yesterday while the family was doing some shopping, and I saw RS there. I wouldn't have given it a second glance if it weren't for the very reasonable price tag. I'd rented it at Wii's launch, at decided it wasn't worth $50, but when I saw it yesterday, I had to grab it. Pretty good deal--decently fun campaign mode and the only 4-player splitscreen FPS on Wii (unfortunately).
Replaying it, I really don't see why everyone condemned the controls so (myself included). Perhaps it's because people weren't yet used to losing the position of the Wii-mote when it left the screen?
Anyway, I played the first two levels last night, and thus far, I don't regret my purchase.