Oh man. I used to box 4 hunter twinks at 19.
They are tons of fun. For a week.

Basically, yes.. they are THAT devastating.. so devastating that within one week of playing them, you will have gotten bored.

I could pretty much solo WSG if I had a healer companion. 4 hunters at lvl 19 simply have way too much dps, survivability and control (boar charge, improved concussive) for any other class to put up a real fight. If I wanted, I could park at the enemy graveyard and just grind them until someone capped the flags.

Edit: I got a lot of love from my teammates, and a lot of /spit and /golfclap and so on from the enemies.