SHOOT!!! Some of us played into the 3rd day before sleeping. I had an entire week off and played the entire time with my friends that I went to Blizzcon 2011 with. It was worth every minute.
I was sad that it wasn't able to keep my attention like Diablo II did once I got to inferno, but that doesn't mean it was not a good game. Without the D2 dev team, it had no chance of living up to the legendary game that we all spent thousands of hours playing through our teens/early 20s.