Multiple backstabs in 1v1: worth the effort?

[SPennLUE]

I can semi-reliably get behind an enemy aggroed on me, but it requires keeping it out of line of sight and I lose an attack or two. Coupled with the less than 100% chance of a full strength backstab, and I'm not sure if it's a more efficient way of fighting.

As a level 13 rogue, I'm assuming I will hit closer to the damage cap at higher levels, but in the mean time I'm not sure if I'm really doing more DPS.