My .02 worth:
The Mazda 6 is a nice car. It offers a rare FWD V6/manual trans. combination in a four-door, and from the published reports appears to be one of the more sporty offerings in its class, which is made up of the Accord, Camry, Altima, and various other offerings. I like the exterior styling very much.
However, it is not a true sports sedan. It may be the most BMW-like of the cars I mentioned above, but its still not a BMW (or a G35, or a C-class benz, or an IS300, WRX, Evo 8, etc.)
Not a flame, just reality. Love it for what it is, but don't be fooled into thinking its something else.