I focus on the DPS guardian myself in PvP, so I’ll share a couple builds with you and maybe you can take one or two things from them and incorporate them into your own.
http://gw2skills.net/editor/?fVAQNAsdRlsApaolDxbI8DNR8gY9nWbqKw1/CmD-TpBEwAGOBAQOCA52fAwhAIbZACPAAA
This is what I primarily use while on the move, great for 1v1 but can join in team fights. It has both great burst and sustained damage, with three gap closers. Nearly perma-fury reaching 90% crit on sword AA. You can chain the focus 5/Whirling Wrath/Judge’s Intervention burst but it’s quite telegraphed so use it wisely. Use your sword AA for sustained damage, don’t forget focus 4 (blinds and regen) and sword 3 for reflects.
13s of swiftness on a 20s cooldown (through rune of the pack) so mobility is good for a guardian. You also get a good amount of power, precision and fury from these runes. You could also use rune of the traveler if you want more reliable mobility. On s/f the sigils are fire and air for extra damage on crits, with hydromancy and bloodlust on greatsword.
You can also swap out blind exposure for searing flames to strip boons.
http://gw2skills.net/editor/?fVAQNApdRlsApZoFDxVI8DNRDBl5KuPmbYEXfgEEAA-TJxHwABOFAn2fAwTAQZZAA
This build is more of on point and team fights. Mace has some good burst along with sustain for you and your team. Utilize the symbol for both AoE damage and healing for your team. Mace 3 does some good damage too. Purging Flames and Absolute Resolution for AoE cleanse, Stand Your Ground and Hollowed Ground for stability. HG can be swapped out for whatever works best for you.
Melandru Runes for condition reduction (on top of the 33% decrease from the after effect of PF). Hydromancy sigils for CC and Energy for damage mitigation.
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As you can see, the guardian can be used in many ways. And these are just dps builds. I couldn’t be of much help though regarding bunker builds, they’re beyond me.
!