GTA v now has an coop mod that allows you to campaign with friends. It also will allow you to mod the game without worrying about being banned.
This is great because sometimes playing normal GTA was boring or aggravating due to every time I spawned I got killed and it was no longer fun.
GTAV also allows roleplaying but you have to have the FiveM launcher and have GTA V installed. There are so many different RP servers that you can join that are basically all over the world. They also have survival zombie ones which are nice!
The multiplayer online has so much more to do like drug wars, bunkers, and all kinds of missions to help you make cash. You can go to the casino, spin the wheel daily and win basically anything from cars, guns, clothing, money and XP. There is just so much to do on this game now.