I'm basing this review solely on the gyro itself. I may be a bad person to ask, and a little biased, but I think Parthenon had one of the worst gyros I've had in the Madison area.
I really like the ambience and decor of Parthenon, but the food is lackluster. I grew up in a Greek household, surrounded by a larger Greek community, and from those experiences, I feel like the lamb meat leaves a lot left to be desired.
The pitas they use are pretty dry, and the tzatziki sauce doesn't have the flavor I'm used to.
I realize that I'm being completely pretentious in this review, but I walked away from my Parthenon experience less than impressed.