In my case, I don't care about resale value. I'll have to keep this car and get my money out of it. And I would rather have it run and be reliable than not.
BTW, it would be hard to sell a MB that doesn't run properly unless you were going to give it away.
And no, I don't think that GM products are any better than MB.
It's just that, I know if there was a problem with the GM engine controls you could get it fixed, and at a reasonable price. This doesn't seem to be so with my 300 SEL.