Not sure how great it is. Listening to the Fan on the way home and they said:
(a) taking into account inflation, it's about the same amount of dollars as the last ESPN contract and over the 10 years, they'll actually end up with less money than in the last ESPN contract;
(b) it takes away regional games, thereby reducing the money they get from the regional carriers; and
(c) they gave away their digital rights, which will likely become quite valuable over the course of the 10 year deal.
If they're correct, then it sure doesn't seem that it's a great deal.