This is my latest Guardian build.
You can swap in basically any weapon set to go along with but 2H Hammer is must have imo.
http://gw2skills.net/editor/en/?fUAQJAR ... Nuak1s4YwBEvery util there is a meditation skill which are traited to be insta cast, and also heal. The heal does like 3K+, so with this build you can heal for 3-15K once on average every 6 seconds. The cooldown on shelter was actually lowered to 20 seconds, so this builder is incorrect.
Sigils of Intelligence to make Whirling Wrath (can hit harder than eviscerate) and Mighty Blow (hits about as hard as a lvl1 eviscerate) crit on every weapon swap.
If you swap in a 1H sword and shield for the Greatsword, I would probably switch up to a Hydromancy Sigil, and maybe the healing sigil (think its of monk or water) that doesn't rely on crits (low precision). The 1H sword/shield instad of GS offers slightly better mobility, better defense, but lacks the burst that Whirling Wrath brings.
Should be noted the #5 2H hammer skill "ring of warding" creates a ring on the ground that enemies can not cross (to either enter or exit) and that this can not be countered by many professions, as the only way to escape it seems to be to teleport, and not everyone can teleport. Teleport + ring of warding means very quickly locking down anyone you want, and can be combined with Mighty Blow for AOE retalition (blast finisher in light field), and then a weapon swap to whirling wrath for ridiculous damage. Ring of Warding lasts 5 seconds, which can be enough time to actually kill a squishy.
If they kite after that, greatsword has a leap and a pull.
http://gw2skills.net/editor/en/?fUAQNAs ... k1s4YAyMEASanctuary and 1Hsw/shield. Not sure if this is more of less healing than other build. Sanctuary goes off half as often as the meditation is replaces but might heal for more than twice as much.