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Tech stuff:
A four-stroke engine's cylinder fires only once every two revolutions. 
A two-stroke's cylinder fires every revolution, so a 2-stroke has (all things being equal) double the output for the same cylinder size.
Problem is that 2-stroke petrol engines don't scale up in size well (though some [industrial] Diesels *are* 2-stroke).
The rotary fires (like the 2-stroke) once for each revolution, so it has [potentially] twice the output for the same volume as a 4-stroke, plus the rotary *does* scale up OK.
Piston engines absorb energy during the compression cycle, giving a negative torque, but rotaries provide positive torque for each entire revolution, since compression, power and exhaust occur [simultaneously].
Rotaries can run to very high rpms compared to piston engines because their motion is continuous rather than reciprocating and because the few rotating parts are small-ish and can be made very robust, while piston engines are limited to lower and lower rpms as they scale up.
Rotaries are thirsty if you cane them, but I get 30 mpg touring at 70 mph in my [1985] Series 3, no mods.
Fuel consumption is an issue - it's to do with the combustion space being a long, thin rectangle, rather than the more ideal cylindrical space of a piston engine. 
And having a turbo giving over 270 shaft HP from a 1.3 litre engine has got to be a [temptation]....
But no, NOTHING else [in the car] park looks as damn sexy!

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