I didn't watch the show, but Disney/ABC took a big risk by moving Grey's Anatomy up against the original CSI, last year's second biggest show behind American idol (I believe).
Well, it looks like it paid off, at least in its first week. Grey's Anatomy was the top watched show last night, beating CSI and finally giving ABC some real footing on Thursdays, one of the two biggest nights for advertisers behind Sunday which ABC has owned for the last two years (with Desperate Housewives and Grey's Anatomy).
The Grey's Anatomy premiere also enabled ABC to win the night among viewers 18-49, the audience most coveted by advertisers.
Its certainly a great day for Disney/ABC. Unfortunately, the new show "6 degrees" lost a good chuck of Grey's audience, and ABC will need to find a solid show for that timeslot to remain competitive.