tinyE: I've been thinking of getting it for PC but IV was such a train wreck with GFWL. I had heard they made improvements but I wanted to hear directly from someone who actually played it.
I have over 3000 hours in GTA Online over the past 3 1/2 years, playing on 2 different PCs and i enjoy it, it's my most played game on steam hours wise so that's saying something i guess.
GFWL is dead and GTA only logs into the Rockstar Social Club, which is not annoying. Performance is great, the game is very well optimized and has a lot of graphic settings to make sure it even runs on older PCs.
There's just a ton of content and so much to do that you never get bored with it and development is still ongoing, so new content comes out all the time.
Over those years i only had some minor trouble. Like once a car vanished without a trace out of my garage (I notified the support and they compensated me with 4,5 times the money i spend on the car, so i wasn't angry) and the cheaters can be highly annoying (they can do all kinds of shit to you, over the years i was turned into a cat, a snowman, was trapped inside cages, cablecars, was set on fire, had a TV stuck to my character....among other shit) which is the reason why i mostly play in a empty session by myself or with friends.
But overall i would absolutely recommend the game. As i said and my playtime shows, i highly enjoy the game and its massive amount of content.
And the single player is also fun, certainly an improvement over IV, imo.
As for the topic:
Currently i mostly play The Division (can't wait for the second one coming out), Stardew Valley with a friend, NBA 2K19 and Yakuza Kiwami