Well i picked Survivor and started with the backstabbing stealth combo, it didn't work that well for me in the beginning, so i also went into the ranger skills...now that is kicking butt. Bow Expertise (plus a bow with speed +2) a few times and i'm shooting arrows crazier than legolas in LOTR. I went into the split arrows though,
haven't tried the elemental one. Split arrows pretty hectic, does 4 hits on 1 target if it's close range or hit 4 seperate targets on a distance.

After that i took the poison weapon thief skill..now i don't know if it's just me but that is almost overpowered strong combined with a bow. I haven't tried the poison arrow ranger skill though (because i prolly don't need to?)..but poison weapon seems to be dual function as it is useable on -any- weapon. Add it to your dagger with backstabbing+sneaking and well...enemy is dead pretty fast (if they're not resist poison of course). Anyway i'm lvl 18 about and using the survivor special move
(sneak) with archery is pretty interesting too, some low sight+hearing mobs
can easily be hit on a distance, then you go in sneak mode and they turn around, you stand up and go again and repeat.

So i have points into my backstabbing etc, but my bow is still doing better because i'm obviously not getting hit. Only thing that i've found useful with the backstabbing+sneak combo is when you know there's a crazy mass of mobs together, then you can sneak up to one..take him out and sneak to the next, they don't seem to notice (if they're not too close to each other). Although deadly gift with scorpions tends to make
it rather useless (have one point in that too, so far it seems to be enough).