I leveled using d/d conditions and sped it up by fighting groups of enemies at once since the build relies mostly on AoE attacks.
This is quoted from a post I made several months ago on guru:
You can of course select a number of styles although if you’re interested in a condition build then I’d say that d/d is your friend. Conditions aren’t as useful in dungeons (the max stack of 25 isn’t that difficult to achieve so if you’ve got two bleed stackers in the group the damage will be considerably less) though but they are great for taking on mobs of higher level than you in normal PvE since, unless I’m mistaken, the glancing hits that are so common when fighting much higher level enemies don’t seem to affect condition damage.
I leveled my thief using a build similar to this: http://gw2skills.net/editor/?fYQQNAoYVlYmCO3dy8E95Eh/hvqzgmts7BXtqWB
and while leveling I went for trickery and acrobatics first, then filled out with deadly arts
The point of the build is to constantly keep moving and dodging through enemies so you drop caltrops on top of them in order to bleed and cripple. It’s made in order to take on groups of enemies so start of by using the short bow to pull some if they aren’t already near each other. I usually then start of with Choking gas to create a posion field and then about two Death Blossoms to apply both bleeds and prolong the duration of the poison. Follow up by a steal (once you’ve gotten the 5 point trait from trickery), using the skill Caltrops and another Death blossom. Depending on how much health the enemy have left you can often more or less just use dodges to avoid attacks and stack some more bleeding, if the mobs have lots of health left use Roll for initiative and use Death blossom a bit more.
If you find that the enemies die too slowly, which can happen if you’re up against higher level mobs, you can switch to short bow and kite them a bit.
Using this build I’ve easily been able to solo DEs more than 10 levels above my level. The conditions aren’t affected by the reduce damage and while you will probably die in one or two hits, the sheer amount of dodges and evades mean you won’t get hit very often. Keep an eye out for ranged mobs though and mobs that use PBAoE, you will need to learn their animations to know when to dodge. (New note: IIRC this has been changed a bit so enemies that are purple to you are now immune to your conditions most of the time. I recommend not going for enemies more than 10 levels above you)
Footnote: Withdraw can be changed for Signet of Malice if you want, the short CD is good for granting vigor and more dodges. Withdraw has the benefit of being an additional dodge while SoM gives you a bit of passive healing while in combat. I mostly only slot Hide in Shadows if I know I’m up against enemies that often apply conditions and Signet of Agility won’t be enough.
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