He's mint, but injured too often. Similar to Woodgate, he's that good (not quite that level but may be one day) that you kind of need to keep him around and hope he conquers his fitness challenges.
However, injury-prone players tend to remain that way throughout their career from my recollection. Anyone got any examples of players who were plagued by different, niggly injuries and then went on to have many years relatively uninterrupted by injury?