He is IMO a very good announcer, i loved him with the Celtics as well. He could be a tad more humble, but he knows his basketball, so on scale of 1-10 i give him a 7.5...
I heard him last night on the PAC12 tournament game with Dave Pasch, they were really good together! And you're right, he does know his basketball, but heck I like Reggie Miller too!