Well using the 55 set of skills would keep you alive, yes, but actually killing the enemies would take much longer than other classes. The assasin mostly relies on the dagger mastery moves for killing, which have recharge times that are too long to be used effectively in farming. Like I said earlier, the assasin is suited more for "assasination" (gasp

)- ie. killing off one person quickly and efficiently, not taking on groups.