Rotarycraft, and especially Reactorcraft would be utter tedium without ore quintuplication though.
The great thing about Rotarycraft in my opinion is that if you can spend the power, the machines become utterly amazing. Grinder at minimum torque at 1MW of power gets you down to 0.05 seconds operational speed. You put a stack in there, and boom, processed within about 3 seconds. About all machines can go down to 0.05 s operational speed, which makes them incredibly powerful even late in the game. But the DC electric engine only puts out 1kW, right? But then power gen also increases exponentially.
1kW for the DC electric, then 16kW for the steam engine, 64kW for the gasoline engine, 256kW for the performance engine, 512kW for the Hydrokinetics, 1MW for the Microturbine, adn 67 MW for the Gas Turbine.
and then you start getting into reactors. 2 GW from a pretty standard pebble bed, then conventional fission reactors, or straight to fusion power, which will output more power than you'll ever be able to use.
Now of course, the power comes in speed and torque. Twiddling around with most of the rotarycraft machines, they usually have one or two points of attack, which scale up output. Fans (which autoharvest and replant crops) increase in Range depending on how much Power you give them (and they do so in a linear fashion), Grinders take speed after their minimum torque has been reached (as in, more torque will do nothing), and Dew Point Aggregators seem to need a mix of both, where minimum speed at minimum power makes them crawl along, but giving them a little more torque will make them produce stupendous amounts of water (i set up an extra cells rig for measuring, it's about 100 BUCKETS/s for 1MW at minimum speed). You'll need to tech up your gears along with your power production, but if you're creative, you can do without them till you need to make jet fuel (where the high amounts of speed required for the fractional unit can not be provided by a single industrial coil).
Once you have a sufficiently advanced power setup (notice how I'm not saying large. 512 DC engines can't even get near the output of 1 Gas Turbine), your default solution to most of your problems will be "Throw more power at it" (it certainly is for me). Got a bit of a mob problem at your front door? Sonic Weapons. Want a kilometer long tunnel within the next half hour? Boring machine. Want to deal 250 hearts of damage? Fully charged gravel gun. Need to store a million buckets of anything in a single block? Fluid Compression Chamber. Want 300 levels in an hour? Spawner Controller.
I turn to Rotarycraft whenever I want to do something that other mods plain can't do, or where it wouldn't be feasible to do so with other mods. TE is nice and all, but if I want to smelt an entire AE system full of stuff, I'm using a friction heater.