He hasn't hurt him.
For me his best work is behind HHH. The triple threat @ Survivor Series was his best match in years. His match with Orton @ Mania was the worst Main event in long time @ Mania.
I think being with Steph helped him but by the time they got married his Era was kinda coming to an end anyway as the top guy.
He is pretty much in charge of how things are run on RAW... so he can pretty much do whatever he wants.