I had a similar "it's great I don't get what people are talking about" experience, only I was running it on lesser hardware than yours: 4GB GTX 970, 12-core i7-5820k, 32GB ram. I ran into a handful of bugs that were funny but not really disruptive (e.g. some dude's corpse floating behind a car as I was on the highway) and otherwise had a blast.
Nonetheless, it didn't really feel finished, y'know? That part wore on me, and I think is what undermined my enjoyment the most. It really was released too early.