I love this game, I bought it on Christmas sale and played it continuously, in 4 days I got lvl 0-83! 70h of gameplay already! It's so addictive! I only played rogue class, but I'm already overwhelmed of the build possibilities there are. I literally can't fit all legendary item passives in a stash tab of 50 items!
I kinda skipped every story line or cutscene, so I can't say anything about that.
The online gameplay is worse than expected: server lags a lot(feels like 2000ms ping) on some events. Servers sometimes even kick everyone out and you lose 10 min of progress. That's why I dropped 1 star.
My pc runs in max graphics smoothly in 240fps(but it kinda overheats). The graphics are SO GOOD!!!! I sometimes just feel exploring the map to see how beautiful everything looks.
I recommend buying this only when you are free to play it, because once you play it, you can't stop playing(quit gym, quit work, quit everything just to be able to play more!)
I'm trying to finish the whole game until the new year, by playing it nonstop.
There are also bosses which give you guaranteed ancestral unique items(best rarity), which have even more powerful passives. I'm trying to get a build full of them atm.