I love the old ATB :/ that's why i enjoy WoFF, it's just like that.
I suppose "new" players enjoy the action system more cuz the ATB is old...it's not so appealing now since there are new systems to go with.
ATB = Slow
Action System = Fast Pace killing
Action system fights also allow you to enjoy the environment, the ATB like system, if you notice, you fight always in the same surroundings, according to the area you are in. I remember they started to change this on FF XII ? I can be wrong, i was like 17 when FF XII came out