As always there is going to be the typical negative rotary myths/false information/assumption answers (normally by people who have never owned one) when a question is asked like this.
I've had my Series 6 13B Turbo Datsun 1200 Coupe for nearly 4.5 years... The motor was rebuilt with a large extend port, GT35/40 turbo, no intercooler, water injection setup and has run 11.4/122mph and makes about 210rwkw.
The car has done at least 100 passes at the drags, been driven to Adelaide and back, driven around Tasmania in a week, thrashed on the street everytime it is taken out, countless burnouts etc etc and has only had the oil/plugs/filters changed in that time (servicing is piss easy, much quicker than my GT-R) with no engine problems at all (and this is from a un-intercooled motor as well).
It comes down to how well the engine is built, how well it is tuned and how well it is maintained. Like any performance car.
You are better off browsing www.ausrotary.com for much better information and answers to whatever questions you have.