I hate the 1v1's with a passion, do so much better in 3v3s. I especially hate some of the matchups, Zen Vs Genji Vs Junkrat? Its no shit we are both gonna pick Genji (Well I pick Zen, because I'm a Zen main)
Also hate the Pharah and Ana mirror matches. Roadhog mirrors always play out like they do in any other mode, the first to hook usually loses unless they fling you off a ledge, and the Mei matchups just feel janky (Like the time I lost a 4-4 because he somehow froze me AFTER my Cryofreeze had engaged).
Just feels like I constantly get thrown into heroes that I do not enjoy playing or don't have much skill with (Since I'm a Tank/Healer main).
Also I feel like Mei actually can beat Hog fairly consistently, or atleast mine can. I usually just bait the hook (Or just stay out of his range and spam icicles), then freeze him the moment he either has to heal or reload. Worst case I'll just turn the match into a game of tag until I get my ult and go for the kill.