I saw NIN a few times, my personal favorite was on the With Teeth tour. Friday night, on the floor, dancing like crazy, the sheer screens with the films projected on them, the return of Reptile and Eraser, Burn(!), and Starfuckers in the encore.
I agree that it does feel a bit premature for Trent to bring it back, but it's his baby and he can do what he wants with it (or maybe I'm just saying that b/c I got to see them a few times). I'll see them again - I never saw a bad show by them.
Also, Trent has picked some good openers (for me: A Perfect Circle, Autolux, Queens of the Stone Age, A Place to Bury Strangers, Boris).