Your comment really leaves a lot to be desired, but I will try to help expand on it a little.  Stalkers can perform large burst damage from stealth, but can also stealth mid fight to either guarantee a crit, take less damage, or gain movement speed depending on the nano suit you have equipped.  The biggest thing that sets Stalkers apart from standard rogues is that they can tank.  They have some self-healing, deflect, and even ranged spells to initiate with.  

I agree and it is quite fun to be playing my Stalker as a tank. The Nano tank setup is pretty easy to do and quite effective. Quite fun to be a Nano Stalker doing your dailys due to the fact that if someone jumps you they usually see you're a tank. Then they just run off.