I soloed Razorfen Kraul with a level 33 orc warrior. However, I went directly for the vial of phlogiston for the Brutal Armor quest. I didn't really mess around with the rest of the area. I stayed in defensive stance and used shield block and shield wall a lot. Mostly I'd shoot an arrow at a mob to pull him away and run back down the path a bit. The real problem was when they'd run in fear and pull other mobs back to you. If you back off and give them room to follow then they won't have mobs close to run to. Having herbalism as a skill, I also was able to use Lifeblood in a pinch.

If you google "razorfen kraul map" then you'll finds maps with directions right to where you want to go.

Since I totally soloed up to this point the chestpiece was actually a decent boon. It may not put my HP at godly levels, but the extra 70 HP I gained getting the thing will help in tight spots. And the 3050 EXP didn't hurt, either.

not much point in soloing this instance. by the time u can do it sucessfuly u realize how useless all the BoP is and how few BoEs there are...

After reading some of the above posts, I was apprehensive, but still wanted to see how far my 32 warrior could get alone. I was surprised at how easy it was to get to Roogug for the warrior armor quest. All the mobs were low greens, with grey pets, and I never lost more than 200 to 300 hp per fight. Only challenge was when I got overconfident and accidenaly pulled 2 warriors and a geomancer, (which I still won the fight with 324 HP), and at Roogug himself, since he had a mage so close to him. Died first time after killing the mage, Roogug's pet, and bringing Roogug to 12% life (got the last hit before I could execute). Killed him second time without any problems.

Thus it is very possible for a 32 to solo this part of the warrior quest quite easily.

The Horde-side L20 warrior armor quest, Brutal Hauberk at http://wow.allakhazam.com/db/quest.html?wquest=1848 also requires a part from RFK - the same piece that the Alliance warrior armor needs.