Most people are haters of what's popular and successful. I believed and I still believe that it's a 10/10 game, and it's now even better with all the DLC and the PC version with all the patches. Oh, and Independant Radio FM ftw!
And I know I posted this before, but I loved the fact that most of the missions were different from each other going further into the story. At one point, you would get on top of a van and do all these weird button combinations, and then you would get on an helicopter to shoot other helicopters, and then you would chase some crazy guy on a bike and then a boat, etc.
I also loved the radio. Some of the most random shows I've heard. The graphics are nice, it's GTA in HD I guess. And the car physics are great! I loved them compared to the old arcade style control in other GTA games. I have fun just playing around with the physics too.
So, I guess, other than not having mountains and vast open fields with nothing in them anyways and some useless workout stuff, it was a pretty good game. Consider it a true GTA game or not, let's just say there are no other games like it this generation.