As much pride as we ad folks often like to take for the rise and fall of corporate empires, the credit, or fault, is not always our own. No amount of advertising can save a truly inferior product, and Chrysler is one such example.
If you want to know what did in the automaker, just check out this CNN article. Then, feel free to speculate on if and how Chrysler can make a comeback.
Good luck Fiat.