I thought about buying Diablo 4, but I'm holding off for now. There are too many reports of authentication issues, license issues, long and/or infinite queue times, and so forth. I think it needs to cook for another couple of months before I drop in.
Also, I'm having fun occupying my spare time with the BG2 replay.
It's genuinely not nearly that bad.
It's Blizzard smoothest launch in decades IMO. Early Access was flawless. There were
some issues on full launch and yesterday but otherwise it has been extremely stable.
People blow things out of proportions. For example, the servers went down yesterday for about an hour. Within that hour the internet was set ablaze. Claims that the game was utterly broken and unplayable popped up all over. People who had been playing since EA were suddenly claiming Blizzard had screwed them over and demanding refunds because they paid for an online games that's never online... having, at worst, lost half a days worth of play time since the first day of EA. It's ridiculous.
Even scheduled maintenances are criticized and used to claim the game is broken because people don't actually bother reading the big announcement saying the servers are down for maintenance. Hell, people claim Blizzard is stupid because how dare they do maintenance on X country/continent peak hours. I mean, who cares that it's always peak time
somewhere?
The game is almost bug-free, runs beautifully and extremely polished in typical Blizzard fashion. It's also a worthy successor to Diablo 2 unlike Diablo 3 and much better than both. If you're really interested in the game, give it a week or two and I'm pretty certain the servers will be as stable as they can be. I mean, Diablo 3 was fine within a month and
that launch was absolutely horrible. D4 was already way ahead of that launch a week ago, it's still way ahead now and it'll be perfectly fine in a week IMO.