You're right. It was epic. Campaign top notch but the online gave me years of fun with my buddies. The perfect game to socialise with friends or randoms.
SA is the best GTA. V's missions made me want to rip my ears off: NPCs just don't shut the f*** up but I guess they gotta distract you somehow from the boring mission design.
I'm happy for those who found enjoyment in this game but this installment felt more like Grand Fetch Cutscene to me...
My two unsolicited cents.