I played through GTA1 2 and 3 fully, then basically missed the rest until GTA5. Played through (decent sale price) GTA5 fully expecting some great writing, based on the reviews and comments, and I was thoroughly underwhelmed. I'll probably skip GTA6 until it's on some ridiculous sale, if at all.
These games seem overrated to me.

The driving is okay, the flying is a bit weak, the combat is atrocious, and the writing is average at best. Voice acting, to be fair, was pretty good.
If people are playing just to drive around and listen to the music, well I can see that, at least.