I don't normally respond to strategy & builds, but I've been playing a DPS oriented warrior, so I'll give you my 2 cents.
DPS warrior is all about mobility on the battlefield. Move in, perform combos and get out. Very similar to DW rogue, just nowhere near the damage output. You aren't built to take a lot of punishment, so don't 'try' to take punishment.
Combat Roll is vital and honestly.. fun to use. Gracefully dodging fire attacks and big hits is quite satisfying.
Grapple chain and the knock down is absolute CLUTCH. It's buggy.. will sometimes miss or grab the guy 'next to' the guy you wanted to grapple, but when done correctly will seriously save your mages bacon, and again.. allows YOU to move around the battlefield and STILL protect your squishies without sitting on top of them.
I usually try to fit "challenge" into my build to 'off tank' and taunt baddies away from my mages when the main tanks taunts are on cool down.
Weapons: Mace or Axe - they are faster animations/attack times, thus higher DPS. Sadly - sword is not optimal for a DPS spec.
+ Guard is 'great' and you can certainly go that route, but your main objective is to NOT get hit to begin with. I use + Crit gear, and take the critical and flank passives from the 'other' warrior tree ( forgot the name, but same tree you get the grapple/knock down chain )
Shield Bash - must have. It's your main detonator for combos. Lunge & Slash is also a detonator and seriously improves mobility. I don't use payback strike. You don't want to get hit, and this power is best used 'after' you get hit. I skip slotting it, and don't miss it at all.
You can slot blessed blades, but the AOE ring prevents mobility, so I prefer War Horn for the 35% damage buff. Fire it off just before entering battle. Refresh as needed.