The dungeon build should be alright for world quests. Especially when you get gear and can do large aoe pulls even as feral.

If that is not to your taste you can try the leveling builds even at level 70. They usually assume you're doing quests or running from one quest to another and they don't assume you have tons of great gear.

I don't have a guide, but I suggest starting with a default build and tweaking it slowly until you remove all the stuff you don't like. Change a talent, fight a few things, repeat.

Also, guardian is a tank spec. They're all slow but survivable. That's the tradeoff. Dps specs, feral, are faster but more fragile.