They have a Hellicarrier! I can't believe they brought back the Time lord hats! And they actually treated Time Lord society seriously for just about the first time since 1975! Captain Jack trying to break the neck of the Master! They just wiped out at least 600 million people - so much for a happy-go-lucky show!
Also liked the tension between the Doc and Martha - very different dynamic compared to Rose, who really worshipped everything the Doctor did.
Interesting take on the Master - very different from the seriousness of Roger Delgado, but then the Doctor was serious at that time too, so this lighter version has symmetry with Tenant's Doc. Anthony Ainley started out as an imitation of Delgado's version, and then just got more over the top maniacal.
Where the hell was Martha going, and why didn't Jack go with her? Didn't seem like much of a plan.