I was disappointed by how short and lacking overall the story seemed to be. I wish there were a lot more heists, as I thought those were some of the most fun missions in the game.
Online play has been hilarious. Take the other day: I was smoking a bowl, riding in a taxi cab to the helipad down by the marina. Just before my cab pulled in, two guys in a jeep drove in there. There were three military helicopters, and one civilian, so I figured cool, they'll take two and I'll take one. Not the case. The fuckers blew up the remaining two choppers. So, I highlighted them on my map, waited for another chopper to spawn. It was a civilian one, so I took it up to the air force base and stole a jet (miraculously, takes forever to get in them with AI shooting at you all the while), tracked them down on the map, and blew their choppers out of the sky. Feels good man. When it comes to GTA, you cross me, and I'll get you back ten times harder haha.
