The defensive style those sides were built on made us one of the best teams in Europe at the time.
For all his big talk, Keane has been proven wrong again and again in how the team should have been lead during our rebuilding phase of 03-06.
Instead of understanding that transitions take time and that there will be lows, his impatience lead to high acts of unprofessional behavior towards our youngsters. His arrogance I have no doubt also contributed to his failure as a manager.
Keane is forgetting that by that time he was truly past it as well. The latter half of 05/06 we played significantly better, including going on a huge winning run (similar to Liverpool last season, come to think of it) with a central midfield of O'shea-Giggs.
He could have taken the high route and admitted that the methods and players he criticized lead to multiple CL finals and PL titles, but instead he is hell bent on repeating repeating criticism that has come out to be invalid.