To be successful in test cricket you have to be able to bowl sides out twice in a test match . Brett Lee was incredibly fast and had the fitness and ability to bowl a lot of overs , Shane Warne was still at the peak of his powers and McGrath world number one at the time , that is some test bowling attack and scoring runs very difficult never mind keeping your wicket intact . Gillespie was very underrated mainly because of the class of Aussie bowler before him . He got his share of wickets and had a fantastic test career . Kasprowicz was the weak link I agree, raw pace but not much control and bowled less overs than the others . Still possibly the best test match bowling attack of all time ? McGrath was a huge loss I think he stood on a cricket ball while messing about in training and tore his ankle ligaments ? The rest is history as they say :)