Mellowed? If anything, Jack seems a bit *more* nasty now that he's the DA. I guess it's the nature of the job, though. None of the DA's this show has had, have ever been particularly nice people.
I do like the dynamic Jack has with Cutter, who is pretty cool himself. Also, I hope Jack gets to take down, once and for all, that idiot NY governor they've had... (no, not the real one, the one on the show