As I said in match thread, similar to Brett Lee - Really good at his best, genuine pace which was good to watch, bad periods were pretty bad. Lee's poor performances really coincided with fitness (basically Ashes 2001 and four years after that, plus his last series) whilst MJ seemed to be susceptible to overthinking, losing his action etc. Couldn't stand him for large part of his career but loved the way he came back in the Ashes/South Africa 2013/14, was brilliant bowling to watch. Though he bowled well after that, ripped in in the UAE without much luck but seemed flat after that, especially after Hughes death.
Not a great, doesn't have the consistency of the top echelon of quicks we've seen, but certainly capable of greatness when on song. Seems a pretty decent bloke as well.