Yes he did. He really really did.
He scored 28 goals that season. Thats pretty much near his own record of 32 goals (I think).
Remember, most sports people will suffer a loss of form during a season. This is actually quite normal. You can't expect any sportsman to maintain top form, year after year, month after month. Its possible that Rooney went through a "slight" loss of form, as a matter of course. I'm not familiar with his personal life, so I can't really go in-depth, with regards to Rooney. I'm sure there are many people who live and breathe football, man utd and Rooney, so I wouldn't want to step on their area of expertise.