As an alpha player: The favorite moment I had was getting my first blue item drop but only finding out I was one level short. I chose the Titan class cause it fit my particular play style, while that may be a very generic answer, I found that class to be rather stealthy over the others. It all depends how you play it perhaps The least part that I found fun was some of the UI, further development with these systems to show more information more easily would increase the playability of the game. Something things you would have to move back and forth between load screens just to get a number was rather annoying rather than it just being on a "pause" screen or whatever. I'm not too sure as for what could be improved beside the basic tweaking of the usual systems since this was the alpha. We're missing so much on how a lot of these systems intertwine so it would be too soon to judge. But what I would incorporate would be a gear tier system that release slowly over the games life if that isn't already a mechanic, as well as integrate an Item level since the number behind the gear name has no real significance to it. ( head slot 2 isn't greater than head slot 1... Or vice versa)