I got in the beta and it made me stop playing BF3 and SWTOR.
I've played more single player than multi, but I swing both ways
I'm having a great time....it's Diablo after all...I haven't experienced any real technical issues or lag. Bugs with tooltips and the career screen, minor stuff. The prior comment about loading: I've experienced it on occasion as well. The first time I experienced server downtime however it was a jarring reminder that this is not like the first 2 in more ways than graphics and skill trees.
I remember when Diablo came out.....and you could spawn a game for a friend to play on a LAN!!! I thought that was one of the coolest features I'd ever seen in a game at the time.
Now look where we are
But I do put it in perspective. I can easily drop $15x2 + at least $10 for drink and grub = $40 for an evening at the movies with my wife.
I'll spend 20 bucks more and get at least a hundred fold more hours of entertainment out of this one.