Been playing Winston a little bit here and there (and trying out Mercy a bit). He's kinda fun imo, I love flanking or getting around behind an enemy and then doing what he does best, jump on top of their group and cause some distracting chaos so your team can advance. He's a little squishy, but so long as you get away when your shield drops, I tend to get a few good leap attacks in before they manage to kill me. His ultimate is pretty fun to just knock the shit out of everyone and cause a bunch of havoc for the enemy team.