I have seen Quick (Ryuushin), outdps quite a few rogue/scouts and w/r's, as both S/R and S/wdn. They are not as useless as some like to think they are... you just have to know how to play them in Chapter 4 instead of facerolling the keyboard.
s/wd during burn phase is very similar to face rolling because it is : Shoot,Shoot,Hidden peril(maybe snipe), Shoot.
And for people saying r/s is very easy, then yes it is pretty easy but you can be skilled at playing it. I hate when people see a r/s and think they are unskilled because they play this class.
Pretty much any dps class in rom is easy, compared to any other mmo. Mages are easy, scout is easy, rogue easy. Warrior is probably the hardest but still pretty easy if you are w/r or w/wd.
Pretty much if you want a challenge for dps in an MMO don't play RoM.