There are a ton of builds you can use it's not that hard to beat somebody.
My Stalker was a ND stalker. He had like 390 Dex, 200k hp, unfreezable, unstoneable, and he out lasted almost everyone because all I did was be a patient player. Stalkers aren't meant to be a class that is so straight forward like Lord Knight, SinX, or Champion. It's a class that's meant mostly for support/survival.
It's a class that is a lot like a runner class. It does hit and runs.