I enjoyed it, though I'll admit one of the things I'll like about the full version is not having to farm the skeleton king non-stop when I play it.
The crafting looks pretty interesting, although it definitely seems to encourage having alts; I can't really say how many times I had to craft the same piece over and over and over again because it kept producing an item almost completely worthless to the class I wanted to make it for.
I liked the monk the most, followed by the wizard and the demon hunter. The Demon Hunter was pretty single target focused though, but can't complain about the damage. I'm not sure how the wizard will turn out, kind of felt like the class that you had to see the skills before knowing how they worked. As for the monk, I think they have good mobility, decent passives, a lot of fun skills, and generally contribute pretty well to the group.
Barb was ok. Probably a more damage oriented class than the monk, but I didn't get past 9 so can't really say much about it. Didn't care for the Witch Doctor. The early skills just weren't very fun. Felt very indirect, though after a point I could have just been going about it that way. I also didn't get past 9 with the WD, so can't comment on the later skills. I'm thinking it'll be more entertaining when not everything dies so fast, but the moment it just wasn't for me.