Hargreaves stands out for me, my kind of player and he was brilliant in the champions league winning season. Struggled without him which was made worse by Fergies reluctance to sign a centre mid.
I think some of these players unknowingly make decisions that badly effect their recovery. Diet, posture, lifestyle choices etc even small decisions or deficiencies. I see the results of what someone like Ronaldo can do by taking the perfect approach and wonder what would happen if Wilshire, Sturridge or Carroll had that lifestyle. There are obviously underlying issues with somebody getting reoccurring injuries but I always wonder if they are managing it optimally.