Warden also fits well as a support "troop" leader with his/her skills to heal when killing other low soldiers, and moral boost to make your owns stronger. As "B" remains important in a fight, this is an option to keep in mind. And it doesn't mean you can't play the warden to kill other warriors. I played most of the time with my Lady Warden Knight and was able to defeat any kind of opponent.
Warden has one of the strongest moves in the game. You can parry any overhead attacks (light or strong) with your overhead light attack, and they take huge amounts of damage. Warden also has one of the fastest nearly unavoidable attacks in the game, where you hit both light and strong attack at the same time and do a spin. It takes a lot of stamina but almost no one can block it if they aren't already guarding to the side.
Warden at times feels almost as strong as Orochi, but you have to play very defensively and wait for people to slip up or attack you with an overhead by mistake.