I boosted my shaman team from 20-40 in SM with my warrior. What I did was a hybrid or arms and fury. I think the key is to have piercing howl so you can get some distance b/w you and the mobs. I think generally what I did was run around in DPS gear but wearing the sporeguard shield with a spike on it. It was kind of a pain in the butt and took a while to kill all the mobs but it worked out. I think I also made macros like "/tar healer" to try and knock out the healers first.

I would run around and try to pull the bottom area of Cath then try to pull the whole top part. Once I cleared that I would go toss something at the boss and pull the whole inside of the Cath. Now that I think of it I always had the trinket that heals you when you block on (comes from last boss in Shattered Halls). You have to realize that warriors are not good at aoe but they can do it with some help from the sporeguard shield and a spike. I ended up getting 5 or 6 of these shields so I could do more runs without having to go repair.

It is possible. It gets slow but you can do it.