For me, GTA V is The Peak of gameplay variety and polished, fun arcade-y gunplay and driving, making it extremely fun to just play.
Adding to that, the characters are super memorable and funny (something that isnt too common) with the rather unique setting of being a parody of western popular culture are just amazingly entertaining, making it easily one of my favorite games of all time, and really a game that has a lot more substance to it than people give it credit for nowadays, imo.