I watched this last night and thought it was pretty good. I know when 10:00 rolled around and knew I'd have to wait another week to see more I was pretty agitated.
I've missed seeing Yvonne Strahovski on a weekly TV show so it was good to have her on 24, but I don't know where they're going with her character and 24 does have a track record for doing some kinda stupid things with certain characters (pretty much anything to do with Kim). Chloe's turn is kinda interesting, nothing in her CTU character ever suggested she'd go goth, though and the comparison to Dragon Tattoo seems kinda spot on.
Bratt and Donovan's characters are new. I think it was just Jack, Chloe and the Heller's coming back so far. I would definitely geek over an Aaron Pierce (Glenn Morshower) cameo though.