Sure zone shards can be unbalanced, the tech tries to balance them, but there’s many factors that can cause temporary imbalance; lfg, player distribution, etc.
I rarely play solo, so 1v10 doesn’t really happen to me. It’s a multiplayer game, so I approach it with a group play strat. Also, I can stealth so 1v10 would not normally affect me if I was solo.
For example, was approx 5v10 in mechagon yesterday. That 10(ish), inevitably included a bounty. Our natural pvp balance mechanic. Used general chat to encourage Alliance to go for bounty, they did, we wiped the 10 eventually. A fun little battle and nice reward.
Many times I’m outnumbered and it doesn’t work out tho. Sometimes does, sometimes doesn’t. Sometimes outnumbered, sometimes the outnumberer. It varies from subzone to subzone, from minute to minute. Love it 
Do you regularly WPvP for the FUN of it? Alliance Defence Force WPvP community and/or guild needs you! Or see list of Horde and Alliance WPvP guilds and communities.