Those probably are good tires, you just got a really good deal on them:
http://www.tires-easy.com/cgi-bin/rs...ahrzeugart=PKW
Items (4): $429.20
Shipping: $37.00
Total for this item:
$466.20
That total is about right for tires for this car (just for the tires) if bought through the mail. I am assuming 225/50R16 tires.