I think he is a very good coach, good psychologist and tactician too - knows how to treat players right and get the best out of them - kind of like Mourinho, only I consider Allegri the better tactician of the two.
Allegri can make his team play some sweet football, nothing like this catenaccio we just saw, but he needs reinforcements for all this and hope the stingy transfer policy soon changes - even an amazing coach can do only so much if he is given former greats to work with.
This being said, he is still growing as a manager and needs to take it up a notch or two to be a CL-winning level coach.