I have heard both good and bad on the RX-8. Did a bunch of research on the RX-8 forums and the general consensus was that the RS-8 is an excellent machine if you're willing to keep up on it. The biggest reason why the RX-8 gets such a bad rep is because of ignorance. Most people don't do their research on the Rotary and treat it like a normal 4cyl and that's a bad bad bad thing.
General tips were to check your oil like it's turbo, so every fill up and add oil as necessary.
the car at least once a day to get rid of the carbon build up. **VERY important** and most common cause of engine failure in the Rotary. Carbon will build up on the apex seals and kill the compression
To avoid flooding, never-ever-ever-ever start your car up, move it and shut it down in a period of time less than 5 minutes... in other words always give it time to warm up. 5 minutes minimum, before shutting it off.
You will at some point in time check the oil and come across a frothy milkshake looking residue on the dipstick. This is normal and caused by condensation and means that the operating temp of the engine is not warm enough.
This link below was by far the best, most comprehensive and informing advice about the RX-8.
RX-8 New Owners manual
To sum it up, to own an RX-8 is to be a person who LOVES cars and is meticulous about their car. People that complain that the engine is bad really have no idea that the Rotary cannot be treated like a regular piston engine. For this reason alone, I'm extremely tempted to pick up a RX-8 after I'm done with the tC. I LOVE a good challenge.