People talking about the amount of hours spent and still getting a refund is treating this as a type of game that has a beginning and a quick end, like a movie, or a pair of pants(?). This game is built around a type of service. You put a lot of time in to make progress, and as you make progress things should start to go smoother due to power of sorts. I bet in that 24 hours the player probably didn't even scratch the surface of what content may or will be in the game. The same was said about Diablo 3, where getting to the "real Diablo" took way too much time for a test to see if you like it sample, so much time that there are now shorter ways to get to inferno or max level activities.
A lot of that 24 hours could have felt like work, and now they're throwing all of that progress away by giving up on it because they couldn't find any enjoyment, or enough enjoyment to keep pushing, even though they kept thinking, "maybe it'll be better if I get over this hill and things start getting interesting." That's how it was for me and Vanilla Diablo 3. It was always the wrong class, maybe if I leveled another to 60 things would be better, especially since I leveled Witch Doctor with paper pets first.