I'm actually leveling a 5-hunter team right now to twink at 19.
When I told my plan to someone from the opposite faction who logged an alt to talk to me, their reaction was: "oh dear god"
I suspect I will kick some ass Just takes forever to get them all the drops from WC etc, lost count on number of runs already, started running it when they hit lvl 10, they are lvl 13 now, no bows or boots dropped yet.
Got them all their ravager pet last night, was fun (I'm horde).
Since I discovered most of the old world instances are capped at 10 people, I just run with the 5 hunters and my main (yes, 6 accounts) in a raid, less xp so I get more chances at getting the drops. Planning to gear them similarly to the 19 twink rogue I have on my main account, though I doubt I will take them fishing in STV, though maybe if I don't continue lvling them after a while.

Going to post more details here (somewhere on the forums) as I get them geared and leveled