I considered this game as a kind of appetizer before the main meal comes (Witcher 3), but gotta say, Rockstar outdid themselves here. The atmosphere is so incredibly strong. I just saw first real thunderstorm and it is jawdropping stuff. I love the script so far too, especially Mike/Trevor stuff.
Car handling is immensely enjoyable, first person view is fantastic eventhough I keep changing it since I like both views.
The euphoria animations are so good. I just did the mission with mike waking from the dead inside CIA and shot everyone there in the legs, and watching them crumble is so damn amusingly fun.
And in some 15 hours of play I had zero bugs or problems, which is nice.