Compare how. And base engine or base trim like fleet trims?
Pretty much yes to both, base engine and base trim (except Malibu).
2.5 Fusion S
2.5 Mazda 6 Sport
1.5T Malibu LS
The above cars have their strengths:
Fusion - quiet, solid, actually has steering feel.
Mazda - best MPG and quickest acceleration. Slick 6AT. Light on it's feet handling.
Malibu - good space efficiency, roomy. Abundant suspension travel.
And their weaknesses:
Fusion - poor space efficiency, unrefined trans, terrible visibility all around.
Mazda - road and wind noise.
Malibu - terrible interior quality , numb steering, poor rearward visibility.
But the better overall package for a person who likes driving IMHO is the Mazda 6.
That being said Mazda needs a new car soon, not just a refresh. The new Accord looks to surpass it in all aspects except maybe interior quality (mostly in rear seat area).
Even the new Camry is reported to be not so terrible anymore.
Reliability of the Mazda has been flawless. The Fusions are not too far behind. The Malibus have been troubling. I've probably driven at least a dozen of these and out of the whole bunch only one seemed to have zero defects. The Malibu is also the only one in the fleet to strand several people so far.