I've played all of them so far and I enjoyed them all until Unity (yes, even 3). The bugs didn't bother me much. The game was just boring. I am also one of those who find the real world animus stuff one of the most interesting things about AC, so when you take that away I kinda lose interest.
Earlier today I couldn't start any of my digital games due to a licensing error. I tried restoring licenses but it failed, I tried deactivating my ps4 but that didn't help. After 3 hours it suddenly started working again. So weird.
I never played the first one but I've tried playing the second one several times since it came out. I think I came 5 hours into it the last time before I stopped. The story and characters just didn't appeal to me. It looks pretty though.
As a result I have no interest in The Witcher 3 at all.
@dr_insane: I had the same problem yesterday and asked Rorie if I had to do it again and he said I had to. You should see the billing page instantly add another year when you pay, and then you get an email.