Personally I hated the whole gang warfare mechanic in San Andreas, so I never finished the game.
GTA IV was filled with details and graphically very good at the time. But the constant hounding by your companions was a major turn off. Fuck that "cousin Romain disliked you didn't pick up your phone while you were being chased by the police" shit.
V was okay, but I also never finished it. Both GTA V and Red Dead Redemption 2 just feels like a chore at some point. As much as I'd want to like them they just fail to hold my attention.
For me Vice City was the part I enjoyed most, not overly long and absolutely I loved the 80's vibe. 🤤
I loved all those games at the start when everything is new and fresh. You're just giving for a while, exploring the world, doing silly shit. Then once it starts becoming a chore to do stuff, or it gets repetitive, I start to lose interest.