You like watching a superb switch-hitting boxer/puncher lace an opponent with textbook combinations thrown upstairs and downstairs with equal amounts of venom? You find that style to be aesthetically pleasing? Then you would enjoy watching Hagler fight. He could do this on the back foot, but became more inclined to move forward as he got older. Either way, he was fun to watch.
Yeah, he was pretty good to watch. Powerful jab, educated movement, good combos, technically sound. Not one of my favorites to watch, but not one I didn't enjoy either. I usually only dislike ugly or dull styles, and his was neither.