i'm really not sure why so many people worry about the value of a car. it's not some super-expensive, incredibly rare car. most are average commuter vehicles. they're a tool. buy them, use them, keep them until they're wore out, and repeat the process.
i never really had a problem with car debt. i currently am driving a Cadillac Escalade with 430k miles on it. i bought it 7 years ago with 160k on the odometer, for $12k. it's been a fantastic vehicle. no telling how much money that truck has made me over the years. it was a replacement for my beat up Tahoe that had about 325k on it when i traded it in.