At level 22 you unlock rank 2 whirlwind which removes the rage cost and makes ww generate rage instead. I decided to test out how good a spin to win aoe warrior would be so I made and geared up this twink at lvl 22. So far he’s preforming very well and I think is far superior to my lvl 20 twink...
Just fyi but though you cant port to the Isle of Quel'danas via Shattrath (requires level 30), you can be summoned there and you can also set your heath there. Magisters' Terrace normal is unqueable, but entering the instance scales it down to your level and many of the socket drops might be BiS...