I'm yet to play Sombra but I don't think I'll stop playing Mei to pick her.
Hacking is cool and all, but freezing does the same while also making people stop moving and doing damage. I'm oversimplying things a bit but that's how I see it.
Still, it's nice to have a new character. Hoping for a new map soon too.
I'm saddened to hear Titanfall 2 isn't selling well.. the game looks good enough. I won't touch the multiplayer but the single player campaign looks well made. I may give it a try.