I play Mercy because I'm too shit to actually be any other character minus Junkrat (who need to aim when you can just explode someone?) and I just can't even with Lucio for some poor reason. Besides, I've always liked support more than offense or whatever, wonder what that says about me as a person. Funnily enough, I can actually calcuate the trajectory of his grenades better than I can aim something like 76's rifle or D.Va's cannons.