Played it a while yesterday, very nice game I have to say.
There doesn't seem to be a choice of gender when making a character. (Witch and Ranger appear to be always female)
Started with a Duellist, but went with a bow anyway, working my way through the skilltree to get some extra damage/speed for it.
Not a very complicated game either, although the skill-tree can be "intimidating" at first glance. Find some passives you want, and work your way there connect-the-dot style.
Since the game will be free, nothing is stopping you from trying it.
No option for Lan games, you need an internet connection to team up. But I suppose the game does not run from their servers once you're outside, so it will probably be a nice co-op game to play on a LanParty.
I haven't played Diablo 3 (yet) so I can't compare them, but the similarities are quite obvious.