Thank you for participating in beta testing of Grand Theft Auto V.
For having played it at least 100 hours, I can tell that I will thoroughly enjoy GTA:O on pc with friends. The problem is that public GTA:O simply doesn't work. They made a horrifying amount of design mistakes, ensuring that actual interaction with random players is basically TDM. Only a few good ideas save the freeroam mode from being a complete failure. The game is great when it generates random activities like bounties, crates and cars that players compete to get in freeroam mode. However, it's shit when there's nothing special to do. It's plagued by a KoS mentality, even though there's no point killing other players.
Outside of freeroam, it's just a copy and extension of GTA4 multiplayer modes. Story missions are the only ones you'll play because they allow you to farm quick dollars and experience, and the other ones aren't more fun (on console anyway, I imagine the TPS parts will be good on pc). Races suck because the driving sucks, and also because all other players are total retards and every race turns into a demolition derby.