I was reading the rest of the comments and I just don't know if the other rogues even tried sub as leveling spec. In my opinios you should level as you favourite spec for late game, not change it every 20 lvls because of the new weapon or ability that you got. I'm talking about starting your rogue, not full gear with 1k resil. But out of all the specs my favorite for everything except raids is sub.
http://rpgworld.altervista.org/335/r...21350135201251
While leveling as a sub rogue I used to kill almost all mobs or players in a single Ambush and one Eviscerate. With full pvp spec that I used for leveling, both quests and dungeons, bgs and world pvp i had over 60% crit change on ambush before lv 30 and I basically started every fight with my enemy at half life. Even paladins or other tanks had to use def cds in the first 3 seconds to survive. It really depends what you want to do with your rogue. If you want to use stealth on every mob, kill them in 2 hits and have a lot of escape moves then go sub also combined with nelf for 3rd vanish or with the dwarf racial to get a second dot remover. I could also sneak behind any mob and pick their pockets to double my gold income and lockpick all the boxes that i stole from them. I had all my bags full in every dungeon before even getting to the first boss and had to figure out which is the least valuable thrash to throw away. Got the 100g looted achievement at about lv 50 and never had any problems with buying my mount or leveling my professions while leveling. You can basicly make this however you want, bleeds, burst, survival, combo builder etc. You just need to decide what you want more.
http://rpgworld.altervista.org/335/r...00000000000000
If you want to use lots of abilities without having to stealth then go combat. For pvp the imp kick, sprint and thrown are useful against casters and very unexpected even for experienced enemies. Ever happened to you that a mage was kiting you and you had nothing to do but to look at him casting his frostbolt without you being able to use your combo points on him? When i interupt mages with deadly thrown they just stay there not knowing what happened. Also with lots of talents that give you extra dodge, parry, reduced cd on evasion, sprint and cos and some abilities like riposte and ghostly strike you should really be able to fight anything face to face. Platers like to attack other melees because of their advantage from armor, but when that happens you can use dismantle, ghostly strike/riposte/gouge, expose armor and then killing spree and they will probably be dead. This spec really shines when you have lots of arpen, the closest to 100%, the better.
http://rpgworld.altervista.org/335/r...00000000000000
If you want to not care about armor and get huge dmg not affected by it then use assa. Poisons and bleeds are not affected by armor so if you choose a muti+prep poison bleeder spec you can get full attack power and make every platers armor completely useless. Just get instant, deadly or wound poison and start with garrote and finish with rupture, then run away while they are dying from your dots. Also use glyph of garrote and try to always put both your bleeds together with your poisons on your enemy and they will not be able to do anything, just interupt if they try to heal and they will be left helpless. Never use arpen on assa specs, always get full attack power. All your dots and poisons get better with ap and except those, mutilate is your only ability that you should only use for combo points. If you want more control you can skip the bleeds and use some ccs instead like imp gouge and kick, but i prefer the pure dmg spec with prep.