GTA 5 is the only part of the series that I played, and which ultimately became one of my favorite games.
I played it for the first time when I was 14-15, on an old Xbox 360, and after that I played it at least once a year, first on a new console, and then I bought GTA on a PC.
Actually, we can talk for a long time about the merits of the game - good graphics (both for that time and for the year 22), an interesting plot, memorable characters, various quests (hello to Ubisoft with endless towers and outposts), a well-developed open world etc.
As for multiplayer, in recent years GTA Online has turned into a fierce donation dump with a completely destroyed economy, a bunch of cheaters and futuristic cars.
But if you forget about the sucking multiplayer, then the game is 10/10