I rented from National at DTW every week for about a year and a half and I never had a serious problem getting a decent car there. I have been in the market for purchasing a Mid-Size SUV, and with National, I was able to test almost off of the ones that I was looking for.

I frequently got cars like the Buick Enclave, Trailblazers, Envoys, Murano's, sometimes even Tahoes, Jeeps, Pathfinders and 4Runners. When I was in the mood for a smaller car, I would get S60's, Volvo Station Wagons (just for fun), mustangs, Camry's, Avalons, Maxima's, Altima's. Basically, if you name it, I got it at some point.

If for some reason they dont have what you are looking for, I would find a lot attendant, and generally they are nice enough to accomidate you if you are Emerald Club.