Current dungeon builds/guide?
http://www.guildwars2guru.com/topic/87167-a-guide-to-the-thief-meta/
25/30/x/x/x is widely known as the most effective dungeon build. ^ look on that site on what traits you should put, extra details on the purpose of the build, and what it’s capable of. Follow the 25/30/0/0/15 classic DPS guide.
If you’re just starting out I recommend putting the last 15 in Acrobatics = extra dodge, more vigor.
Your primary way of survival is using AoE blinds and evasion. Optimal weapons are Sword/pistol + shortbow, or dagger/dagger against one boss. Sword/pistol is the best as you can use #3 to deal damage and evade. #5 is extremely good for AoE blinds which can make most encounters against trash mobs a joke. Shortbow is really good at blasting combo fields and AoE damage.
(edited by Tachii.3506)