I rather enjoy GTA:Online that to enjoy a buggy crap multiplayer game from scratch because its not worth it
GTA:Online is buggy, half the sessions disconnect and the structure of the game is boring: all people do is run around and DM. You have to grind to make any meaningful amount of money, the races suck (all the classes are dominated by one car), the lobby structure is extremely tedious compared to rolling gamemodes like AX, you spend most of your time waiting rather than playing, you can only have 32 players on one server. It leaves no room for customisation and scripting either.
I would happily lose some of the perfect synchronisation and have the capabilities of SA:MP or MTA for GTA V.