Charr warrior with 'tanky' build reporting in using Mace/Shield + Hammer.
Oh how I love that awesome feeling when you can survive tons of mobs and high damaging attack and auto attack in front of a champion while I go afk away.

My traits are 10 Power, 30 Defense and 30 Tactics. I build it the way where my shouts can heal people, so survivability is higher than usual.
All my equipments stats also concentrate on Toughness and Vitality, so my build have high survivability, but quite low damage lol.

Yeah I tried it, kinda fun to 'tank' the boss while my friends go nuke it down lol.
You can 'tank' in dungeon with the right build. You'll still take painful damage if you're not careful. So evading and blocking attacks is key to 'tanking'.