Ok... I took your advise to try Marksman again before completely pushing it off as completely worthless.
And while I do feel it lacks in PvE, It really helps me burn down them casters quick. It is nice to not have to rely on a pet at all times to burn someone up. Unfortunately my pets attack speed is not the master "caster interference" that she use to be.
But all in all I love it. Silence shot is nice for those who are trying to cast a painful spell on me and I want to avoid it. Or the pesky healers to keep them from getting off a greater heal.
Aimed shot helps reduce how much the druids get healed for while in SV that is a life saver. And even in PvE where in places like Arc where the boss starts healing herself after her whirlwind attack. Put that Aimed shot debuff on her and bam, a lot less health healed when she tries.
I think I will prolly stay MM for a while longer. MM/SV ATM. Trying to gear up and I hate being so dependent on my pet that if she dies I lose one of my biggest DPS output moves.