I would say his abilities as a No.10 are bizarrely underrated. Fergie deemed him good enough to play in the role for years, after all, and he generally averages a goal/assist per game there, while contributing more defensively than a lot of other high profile 10s do.
People will say that while he is productive, he doesn't have the passing abilities or vision to properly orchestrate attacks. And while there are certainly others who do have better short passing and a better touch than Rooney, there is more than one way to skin a cat, and if Rooney's way leads to as many if not more goals/assists as (say) Kagawa's way, why is it necessarily inferior?
Jonathan Wilson wrote probably the
best article on what Rooney offers as a No.10 - and why some insist on comparing him unfavourably with his peers - a couple of years ago, and much of it still holds true today.