It's subjective and entirely dependent on the content you do and how often you do it.

Content below Extreme is entirely braindead and no job changes will make it interesting.

Extreme and Savage become outdated very quickly because gear scaling is ridiculously powerful in this game. The numbers get diluted quickly in the case of savage or undertuned on arrival in the case of something like Diamond Ex. How is a fight like Diamond Extreme, tuned for i510, supposed to pose anything other than a short-lived mechanical challenge to a group of people wearing an i530 set?

Ultimate becomes mostly a mechanical challenge because by the time a full group gets consistent enough with the mechanics, they're on autopilot.

I don't think a silly little rotation is going to fix anything. I think the game needs some fight randomness (especially to incoming damage) and a massive gear scaling nerf. Alternatively, something like unreal scaling for new content (e.g. scale to i510 for Diamond Ex until 5.55).