I find Ruffalo a lot more sympathetic than Norton to be honest, Norton is a good actor but always has a bit of a 'smarm' factor about him. He's the sort of person who works best as a smartarse character. Though I say that and he actually worked well in Moonrise Kingdom doing the complete opposite role. Regardless I think Ruffalo had the best balance of being a little dorky with the intimidating factor just beneath the surface.