Grand Theft Auto V is amazing. It looks gorgeous, and its level of attention to all the little things in the world around you is breathtaking. There's so much to do, in an enormous world filled with detail. The main storyline is long and has a lot of memorable missions, with a lot more gameplay variety than the missions in Grand Theft Auto IV had. The driving has been perfected from GTA IV, too. The characters are all likeable, even with different personalities, and completely different backgrounds. The way Michael, Trevor and Franklin interact with each other in unforgettable.
What disappointed me though, was that after you played through the main storyline, you couldn't do anymore heists... That was one of the best things about the main storyline.
Even if you weren't a fan of GTA yet, you'll undoubtedly enjoy Grand Theft Auto V.