If the average new car is +/- $30k, which it is, yeah, a $500/mo car payment is reasonable for the average new car.
FWIW, both of my cars have a payment of a little over $500/mo. One cost $28k + TTL (financed at .9%, so I didn't bother putting anything down) and the other was +/- $40k, with ~$10k down (wife hit a deer, totaled her car, payout was the down payment) at about 1.9%. We try to stagger payments (pay off a car in 4 years and drive it for 8, so you only have one payment at a time, but the totaled car threw a wrench in that plan. Combined payments are still less than 10% of our net income (which doesn't include money sucked out for investments, savings, etc).
Not very MMM-friendly, but I don't work hard so I can drive a shitty Fit every day. Sorry.