lol I was wondering how long it would take for the rotary Nazis to wander in here and start defending the reliability of their motors.
I've owned an R100, two RX-3s, a 13B turbo RX-2 (Fast Fours Project Pizza Delivery, for those old enough to remember), a S1 RX-7 and a S8 RX-7, so I'd say I'm in a reasonable position to comment.
There's a lot more to owning an old school rotor than how reliable the motor is (for the record, they're just as reliable as any other motor when serviced at the correct intervals).
Firstly, the fuel consumption is woeful - I defy any rotary owner to tell me otherwise. If you're going to spend 90% of your time stuck in traffic, you're better off keeping the rotor for weekend thrashes and buying something cheap and economical as a daily.
Secondly, as someone mentioned before, you're talking about 30 year old cars these days - parts are difficult to come by, and expensive to purchase when you do. For your own survival as much as anything else, make sure all the safety-related components have been modified (suspension, brakes etc) because hitting something at high speed in one would be far more disastrous than if you were in a car built in the last 10 years.
Thirdly, I wouldn't be leaving them in a public car park if you wanted to see the car still there when you finished work. You can install all the alarms in the world, but that doesn't change the fact that any 15 year old with a length of blue packing tape could be inside your car in under 20 secs. They were designed in a time where theft (in Japan at least) wasn't a very big issue.
My search in Japan still continues for an R130 Luce