Good questions. I really liked the work to the third at Carnoustie. True most people hit irons, but I stood and watched play there for quite a while, and there were a bunch of different approaches taken. Essentially it seemed a three option hole. Very wide scoring range, which seems unarguably a good thing. For me - HIT!
Turnberry 16 - was my first Open there so can't compare to previous events. Shaping work on inside of new dogleg very very good, increased angle didn't appear to me to make much difference. Move required to extend 17th. Verdict - HIT(ish)
Lytham 7 - didn't know the original, can't speak to it.
Birkdale - imo the greens there are mostly pretty dull. I like the 17th far more than Martin H does, based on a conversation I had with him this summer. Saw Tom Watson play a genius recovery shot there during the Open, using slopes behind the flag to bring the ball back the holeside. That hole - HIT! (If people say 'Oh it's out of character', then maybe the problem is with the other greens!)