I think he is a world class manager and better than Houllier. First and foremostly he is a better tactician and better at getting the best out of what he has got (that, as well as luck, is the reason he won the CL with Liverpool).
I'm not sure he would be right for us, though. His Liverpool connections, seemingly bizarre tactics and cold, analytical approach would probably lead many fans to view him as another Houllier.
His transfer record is mixed. He bought some shite, but he also signed Torres, Reina, Mascherano and Alonso who all have been or could have been sold on at a massive profit.