70% on GR is average for a "name" game.
By average, I mean.. a rental. Only buy if you enjoy the genre.
In the case of B&W2.. you can\'t really rent it. It\'s probably worth your time, but would do a lot better in my mind if Peter Molyneux wouldn\'t set the bar so high for Lionhead.
I don\'t think he hyped B&W2 a lot, though. It\'s just a sequel to a flawed "masterpiece"..