what's the worst thing mopar has done?

On an individual "brain fart" how about the decision to make the biggest motor in the Prowler a V6? And they wondered why it didn't sell? They should have had a Hemi, V10, and 360 option.
On a corporate level, not having the guts to tell the union and the government to take a hike! If Chrysler had told them that they were going to shut down unless the union eased their demands and the government stayed out of the car business, they would have been a lot better off.