They are markedly better than Rousseau's first four years (so far), though.
His best season is 8 sacks, and he got nearly all those during a period when Von Miller was playing with his hair on fire. As soon as he went down, Rousseau disappeared. I mean, he's a good player, but he probably should get a gigantic contract when you still have to extend consistent playmakers like Shakir and Benford (and possibly Cooper).