I got the infamous "Error 37" for about half an hour or so, but eventually I was able to log in and play. I'm starting off with a Demon Hunter, mostly because I think she has the best voice. It's really too bad there's no knight/paladin archetype in D3.
I got to level 5 before deciding to go to sleep. The cutscenes are very nice. The game does seem a little harder than it was in beta, at least starting in the cathedral. But that might be because the first group I ran into was a pack of champion bats, with a couple harvesters mixed in, so maybe it's just a skewed first impression.
I am thinking about trying Hardcore mode, maybe even from the start. But I'm not sure I'm the type of person who can restart and replay from scratch when my character dies. I rather think I'd just end up playing something else instead. So maybe Hardcore isn't the best idea for me.
How were your Diablo experiences?