Infraction: 3. All discussion should be both polite and civil.
Message to User:
The last sentence of this post is literally noting more than explicit trolling. There's a legitimate disagreement between you and others in the thread about how much skill mutilate takes to play; this isn't a matter of trying to salve our wounded egos as you so crudely imply.
Yes. Moving and using abilities is harder than moving. It divides up your attention. It makes you less focused on each task. It makes you more prone to error. It makes it easier to make mistakes.
I'll say it again. Doing something is harder than doing nothing. If class A has to sit there and do nothing besides target the boss and do X DPS while class B has to press 1 every second to do the same, then class B is by definition harder to play. It might not be hard enough, it might require improvements but it is harder. Harder meaning it's easier to disrupt class B's DPS and it's easier for a player of class B to fuck up, meaning the DPS-skill gap in class B will be greater.
And all of this is what separates players by skill level (not the only thing, mind you, before someone decides to lash on that). Rogue rotation is more forgiving. If you don't use Envenom you risk maybe possibly in the future clipping it. That's about the only penalty you get.
No one likes to hear that their class is simpler or easier to play or whatnot. That's ok, it's not you that design classes, it's the devs to blame.