After having so much trouble playing Hanzo in the beginning, he has become one of my favorite heroes, and probably my best character skill wise. Had two straight matches with a GAF group last night where I was the MVP with him. Staying back and constantly taking potshots is certainly a good strategy at times, but people are severely underutilizing him when they do just that. He's not Widowmaker. This dude is amazing at mid-range, especially when your around teammates or shooting close behind them. Taking constant potshots can be good, but people have to start getting used to aiming their arrows where people are going to be. Once your used to that, his damage output is ridiculous. Don't be afraid to just jump on the objective with everyone else and start nailing people anyone who gets near. Combine this when scattershot, and even the flankers have something to be afraid of. He also builds up his ultimate crazy fast when your consistently hitting people. I had so many dragons flying around last night.
Man, he's such a fun and satisfying character once you get the hang of him.