That’s just my opinion, people’s reasons may vary greatly.
- Sombra : invisible, silent assassin. No need to tell much more (though I could mention the wall hack, the high damage dot, soft CC and get out of jail card…).
- Zarya : I don’t have much hate for Zarya. Her beam can be quite annoying if you underestimate it, or if your team keeps shooting her bubbles. I don’t care much for her though.
- Freja : clearly overtuned right now. Her right click is extremely strong, with no fall off, no ammo usage, a wide projectile with an explosion radius and fast travel speed. Combined with mobility and a small hitbox, she really is a pain. It’s even more clear in high ranks, where she becomes the most banned dps.
- Mercy : I love her, personally, but I know people hate her damage boost that makes some heroes a lot more powerful (and breaks some thresholds on damage), and they hate her rez too. Banning her renders a lot of other dps heroes a lot more manageable (Pharah, Echo, Sojourn, etc…), hence the ban, imo. Why bother banning all those heroes when you can ban the one that makes them too powerful ?
- Moira : I think she’s mostly banned in low ranks, where she overperforms by a large margin : she barely requires aiming, has self heal, sustain or damage orbs, and a powerful get out of jail card that makes her extremely hard to punish if you don’t have good aim and good reflexes. I’m not surprised to see her banned a lot.