It feels ok 
I guess everybody agrees that it will never be as good as kb and mouse, but I can enjoy using it from time to time.
My point is: it would be nice to include some force feedback feature. Maybe when making crits (though it might proc too often), or when overkilling an ennemy, or using some particular oh sh… ability.
This would add a very good feeling to the game, and (I guess?) it must not be too hard to implement.
Like one thumbstick to move the other for direction of attack, with the shoulder buttons for left and right attack; top shoulder buttons for auto target selection overide.