I totally understand what you're saying, I think the RX8 is a great car in concept, the problem is the engine is comparable in terms of efficiency to engines built 40 years ago. You could say the lack of research and development makes it an unfair comparison, but unfortunately that's the weakness.
By the way, any particular reason why you don't like Hondas? I'd personally love to have an S2000
such a cool car.