I really wasn't big on TFA, which to me just felt very lengthy due to the constant deja-vus. But- let's not get ahead of ourselves, the man has talent and can surely deliver, regardless of one's stance on Force Awakens.
I would have preferred to see someone new, mainly because then I'd have no in-universe reference point on how to picture this directors vision, but it's way too early to tell if IX will suck. If anything, the story beats of The Last Jedi will probably have quite a bit more impact than the choice of director.