Open.mp will be more fun than GTA 5, even with rage multiplayer. So open.mp will blast away the other multiplayer engines out there, it'll be well programmed and stable i believe, if its the same source as sa-mp then it'll be very awesome. ;)

Maybe somebody will release Partyserver again, for Open.mp instead of Sa-mp, some of us miss partyserver https://steamcommunity.com/groups/PartyServerSAMP