The topic starter said the 0-60 was 5.5 seconds, then corrected it to say 6.2 seconds. Which is about what it should be given the weight, power, and additional drivetrain loss of an AWD system.
Magazines have clocked the standard 6s mtx at 6.7 0-60 (best time) but generally close to low 7's 0-60. Modified 6s mtx's have gotten low 6's, and 14.x 1/4's, with one actually bumping into high 13's (not posted) NA.
The MPS is a good car, but is hampered by its incredible curb weight (3589 lbs base model). Its a GT car, not a racer, and should be treated as such. Legacy competition, not SRT, redline, cobalt, STi, WRX, or Evo competition.
The most depressing thing I find about the MPS 6 is the fact that even though its a GT car, the rear seats are unable to be put down (supposedly), greatly hampering its utility. If mazda was interested in making this a GT car, why isn't it a hatchback with the ability to put down the rear seats? That would have been far more competitive then the additional "rear stiffening" caused by bolting the rear seats in place.