Yeah, Dancer is definitely the easiest. And as long as you're hitting your dances (which is extremely easy) your dance partner and team will be largely benefitted regardless of your own personal play so you don't even have to be perfect on Dancer anyway.

I also find Machinist very simple. You do have to hit certain buttons a lot but outside of that the basic play is not complicated at all. It's very obvious when you need to hit certain buttons and despite having guages the use of them is extremely simplified. As long as you have decent ping, Machinist is dead easy.