This car is an absolute steal. I was sold on the 350Z and ready to buy, but felt that I needed to compare to at least one other car. After test driving both, even though it was a cosmic shift, I couldn't buy the Z. The RX-8 is one of the most fun cars I've ever driven - it's my first rotary, and the smooth, almost electric feel of the engine is beautiful and highly responsive. Take a look at the low reviews - they are primarily from people who seem to have trouble red-lining a car that can go to almost 9K rpms. If you've ever driven a stick and/or have normal hearing, this isn't a problem at all - and one reviewer with red-lining problems also complained about fuel economy - correlation?
Engine, suicide doors. Full back seat is nice, esp. since no one realizes it's there until they're next to the car. If you've never driven a rotary, you need to try it - you may be hooked. Rotary gives lower fuel economy, but do the math on purchase price v. lifetime gas - RX-8 will beat most comps.
Fix the marketing. Some buyers are racers, some older/want a practical sports car. RX-8 is a chameleon - smooth ride for touring but can be a feisty sports car, high performance but can seat 4. No identity means lower sales and a steal for buyers, but we want it around for years - pick an identity!