I still find it a little dissapointing that Rockstar pump so much time and effort into DLC for GTA Online, yet completely discarded the DLC for single player. I guess they know where the money is for them now.
As soon as people started to buy shark cards by the bucket load, the DLC was recycled into online.
It was a massive shame they never extended the main story as I have done 3 playthroughs and it is so engaging.
Saying that, GTAO is an amazing game as well. So swibgs and roundabouts. Also with this new DLC, it can be done entirely solo. Which for a lot of players will be very welcome.