I shall be honest I never understood the popularity of the series sure they are not bad games but calling GTA the best game series of all time makes me question the sanity of gamer´s.
Honestly all the deal of GTA games were open world gameplay because considering that era it was new and amazing for being more like real-life which was a "wow" thing, besides that until GTA San Andreas GTA games were shit. Until GTA 3 the games were more like "get the tank and have fun causing mayhem to the city" game, afterwards GTA 3 and GTA Vice City has the most nonsense story and therefore its missions. GTA 3 is especially boring, Vice City is brain dead. There is just an excuse of a story just for BS missions.
But GTA San Andreas is very different. Character variety and depth like Final Fantasy 6, a really solid story which for its story alone GTA SA would worth to play and I say as a person who doesn't give a shit about stories in games and I skip dialogues and cutscenes which only very few game made me care about their stories lol, the great sandbox gameplay from street racing and car modification to military jet action game, I would sometimes roleplay as a serial killer between many villages and 3 cities lol. It was also interesting to roleplay as X-Files agent who research weird shit in the game and find interesting stuff. GTA San Andreas does have nonsense missions but it's sometimes just for the sense of humor but there are good fun missions too. It was when finally GTA identity was finally found.
But sadly GTA series died with GTA 4. It's like most stupid AAA game in existence, I wish it was cancelled lol. What to like about the game is its real-time ragdoll physics makes killing people with hit and run fun lol. Certainly it's not a fun game when your cousin call you to play bowling while tons of criminals and cops mutually try to kill you by cooperating with each other despite how all these shit is funny lol.
And then GTA 5 is nonsense in another BS way. 3 playable character you must switch sometimes, never liked that BS especially when game force you to switch to generic cringy crazy guy just because such type was popular in that era and the guy is in middle of nowhere with his underwear. It's like they developed the shit game for 6 years old kids. While missions are not BS whole game is about heist theme which I don't like this theme whatsoever. Still in general sense technically GTA 5 can be said as "best decent GTA" for it doesn't have BS missions like previous games, yet when GTA San Andreas exist no other GTA game is satisfactory.
However it would be usual to hear only GTA San Andreas and GTA Online is what actually loved the most, as for other GTAs they are just nostalgia shit and people tend to like GTA Vice City radio stations instead of the game per se lol.