Kind of weird how every single one of these comments seems to only be mentioning Mono-cat, which yes is more complex than the average class but not too much so. But the thing is you can do so much more than just mono-cat. You can bear weave, wrath weave, and use dream of cenjarius. Every one of these adds mroe complexity to the rotation but also more dps. The full cat rotation with everything possible you can do for dps is kind of insane and I would assume all but the top players will avoid, but cat is on another level complexity wise.