I'm kinda mixed on this. He was involved with some stuff I like (Person if Interest, Fringe), but also some shows I thought were not very good (Revolution) or outright bad (Lost). What concerns me more is that I found his Star Trek reboot to be mediocre at best and outright terrible at times (for reasons unrelated to the original movies; it sucked on its own merit).
All in all, I'm not too thrilled about this. He's a TV guy, not a movie guy. Plenty of people who are more qualified for the job. I'm not going to go all "DO NOT WANT!!!" like many people in this thread, but I'm starting to become slightly pessimistic about this whole Star Wars sequel thing...