I personally think that the game may be a little bit less engaged (not a huge amount but auto attack takes away something that can keep the player focused and engaged) I DO think it could be a great improvement though if they add some strategy to it.

My thought is that if they were to add stances to the battle system it would be a great improvement. Being able to switch stances depending on the situation would be a great addition to the strategy to the combat.

Tank goes down, then your whole party can go to a defensive stance until someone revives him. Switch from weak fast attacks on small low defense or numerous enemies to slow heavy attacks for armored enemies. Or if you needed a fast healing spell you could switch from a slow strong casting to a fast weak spell casting stance on the go.

I would love to see this added to the game as it would finally add something new to the overused Tank, Healer, Damage Dealer strategy that is always used in MMOs