I really enjoyed it. All that snappy Aaron Sorkin dialogue (where everyone speaks like they're getting the last word) suits the setting as well as it did on The West Wing, and the casting is very strong.
I've always liked Matthew Perry and despite his record of lame movies, he's really in his element on this show. I also have a crush on Amanda Peet.
I suppose my only worry is that there may not be enough warm characters to balance all that showbiz cynicism.