Didn't find any thread about the game so I decided to make one since I got an Alpha invite
I played alot of Dota 2 so I have some experience in Mobas...
The game is fun so far, games are quick (15-30 minutes) compared to Dota 2. There is not itemization in the game and you only pick your talents and your skills.
I'm just lvl 6 right now so I haven't tried all the heroes but you have different roles : Assassins, Healers, damage dealers, support. It's fun to use Blizzard's Heroes into a different universe. You have Heroes from Diablo, Starcraft, WoW and Warcraft.
Yeah that is a big part of the appeal to me, shorter game time, more focus on team then individual. I know there will still be toxic players, tons of bm, but I imagine it will be more like WoW PVP where people BM the team and not so much individuals for being bad.