Is this something you have or want to get? It really makes no difference how I would "rate" the system since it's highly subjective. For example, I wouldn't buy a Denon AVR-4308 retail because it has much more than I need. I also would never buy a Definitive Technology Mythos One setup retail because it's design goal is more fashion than function. However Def Tech pulls off having excellent fashion and sound in the same package giving them an edge in the high end market for people trying to have a beautiful decor.
I'm sure the system would be great. What you won't get here is a bunch of contrived non-sense based on personal feelings toward a brand or product. That receiver has enough power to run the Mythos One system with great ease making it seamless in operation. Sound quality will be dictated by how the system is calibrated and positioned. The receiver certainly won't be limiting the potential of the Definitive Technology Mythos speakers.
Other forums will debate over which receiver sounds better with which speaker, you won't get much of that here. As long as power requirements are met you can usually count on the receiver to be doing exactly what it should. If the Denon has all the features you want/need then go for it. If the Mythos look and sound good to you, go for those as well.
I hope I reassured you and made you feel like you made or are making the right decision based on what you have read and heard.
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