He's Manchester Utd's best defender, this is a team who have dominated our League for the past few seasons and have been to two European cup finals in the last two years.
Nothing to do with having better players arround him, he's there best defender, Manchester Utd fans will confirm this for you themselves.
Also, how is he not giving 100%? Because he doesn't run around like an agressive headless chicken like Wayne Rooney? Give me a break, every footballer is different, they all have different personalities and act in different ways on the pitch.
He's a top class defender who's had injury problems of late.