The problem is that because of bankruptcy, this is literally not your father's Chevrolet. It's a new company and they are saying that they are not responsible for the old GM's mistakes. While that legally could wind up being true, you burn an auto buyer by sticking them with a lemon with your brand badge on the grill, you could lose a customer, for life.
My grandmother bought a new Pontiac every year until 1970 when a dealer refused to fix something simple having to do with the linkage on her 6 month old car. She never bought another Pontiac again. Few things inspire brand loyalty like a vehicle here in the USA.
I think that GM is being short sighted to save a buck and it could really forever tarnish the brand. That could cost them more in the long run than fixing the problems.