Wow, yeah. This. I didn't even look at your weapons. Go buy some crafted ones if anything.Also go subtlety or assassination. Combat, to my knowledge, is still terrible with daggers (Exception being the legendary daggers).
this is my combat rogue: http://us.battle.net/wow/en/character/malygos/Argel/simple
As you can see she's not that great either but she does survive the farm mobs.
I've not tried it, but I imagine going on a toon with gear lower than can get into heroics may be squishy and/or make it take so long to kill the mobs that the time would be better spent elsewhere (my time, not yours - that's entirely up to you).
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