I only ever played GTA2 during the 2D era. I remember loving it then though. Maybe I ought to emulate the classics on my Steam Deck.
Of course I was obsessed with 3 when it came out. And Vice City and San Andreas were master pieces. I never played the PSP/DS games (those might also be good Steam Deck games for the future.)
I did beat 4 and its stand alone expansions. They were all pretty great, I even kind of liked the driving when everyone else was hating on it.
I have had GTA5 sitting in my Steam Library for a very long time with effectively 0 hours played. I'll get around to eventually. It looks like I'll enjoy it, though I hear its single player isn't as good as 4's.