If we need stealth and positional attacks then it should imho boost us to the top of the dps charts. No other classes need this, no other classes (bar rangers I guess, who imo shouldnt use poisons being of "good" class) have to pay to get their DPS in the form of poison (which costs a fortune), no other class has to pay for arrows to use some of their big attacks.
Our damage totally depends on all of the above. So many times ive hit stealth attack or ran back for a bow shot and some numpty (usually if we have a swashbuckler in the group) pulls WAY too much aggro and makes the mob turn which kills off any flank attacks I was about to do = dps bottom of the chart. This is really bad when you stand back for a bow shot only to get the message that you should be behind the mob, all the time backing off and hitting your bow attack just totally wasted...
I still dont see any need to log into the game, 2 weeks with no groups and a week of not even bothering logging in. Fun...