Penny Arcade does a web comic about video game QA, along with tales from the workplace such as this: http://trenchescomic.com/tales/post/let-slip-the-dogs-of-war
If the code is bad, it's probable they need to do more than just fixes but large overhauls. A difficult decision when you have customers saying "please fix the game I bought" and have a PR scandal to handle.
A possible course of action would probably to apologize, acknowledge the problems and do a gesture, such as getting rid of the DRM, to appease customers.
Then you'll probably one year to fix most of the problems, call that an extension pack and offer it free of charge for anyone who bought the game before a certain date...
Meanwhile have another team to extinguish as many fires as possible...