Since profession theory-crafting is so much fun, and we are all about Warriors today, this is my typical GAFractal build. It changes some on bosses where I bring Rifle instead of Bow or when I bring Axe/Mace instead of Greatsword, but this is the basic build for most of the runs.
http://en.gw2skills.net/editor/?fJEQJARTjMd09ZtHWeQHaAmgCXnfNCCg0rQME8A-ThBBABYt/o8DgLpQe6aC4JFUp6PnpEMAACwv9N+23IxJOxJeiTciTciTsf7bJ+bJ+bSBYuwI-e
The idea is to support the party over pure personal DPS, but I still want to do my part in burning foes down too.
Empower Allies is +150 power to each party member.
Banners of Strength/Discipline are +170 power, condition damage, precision, and ferocity to the party, and they can be picked up and used for their swiftness and fury skills and planted as a blast combo finisher.
For Great Justice is additional party might and fury.
Battle Standard has nice boons, but it is really there 99% of the time as the "oh shit, the entire party is about to die, maybe now would be a good time to do something to help" button.
Critical hits from any Greatsword skills (particularly Hundred Blades and Whirlwind Attack) help stack might on the party thanks to
Forceful Greatsword and
Phalanx Strength.
Bow use is preferred over Rifle in general cases largely for Combustive Shot so I can have a reliable fire field to blast my banners into. AoE damage, burns, blinds, and immobilization are all nifty too.
Healing is all passive with the
Healing Signet,
Adrenal Health, and
Omnomberry Ghosts. I almost never actively think to use a healing skill; if I get into trouble, the best thing to do is to back off and play defensively/ranged for a few seconds to build back a little HP. There's no room for condition cleansing, so pray to Dwayna and hope for the best!
The only major change that happens outside of weapon swaps (and fitting in their corresponding traits) depends on how the party seems to be doing. Swap in Soldier Armor with Traveler Runes when a little more bulk is needed, or fit
Banners of Defense/Tactics in to boost party survivability as a whole, along with swapping in the Tactics Grandmaster Trait
Inspiring Battle Standard for constant health regeneration.