Edit: It occurred to me that the attack buttons were mapped to 123 because that would be fine on a full size keyboard. Consider that not everyone uses a full size keyboard or might be on a laptop.
I tried playing just now. It was very annoying having the controls WASD but the attack buttons 123 right above them. At least have the attack buttons on JKL so both hands can be used on either side of the keyboard. This seems like a pretty obvious oversight for game controls.
I didn't play very long because of this annoyance.