Pros
If you like manufacturing, its the place for you. Its like working at the Willie Wonka chocolate factory, only that its car parts. Cool for the first few weeks if you're me.
Cons
Not challenging at all, feels like babysitting a bunch of old folks (union), some are good but the majority do want to sink the GM ship. Plus you'll hate putting on the radio, the working conditions are terrible, at least at the Flint facility, sound pollution, very dirty, not a very healthy facility. Plus, some of the managers seem like mentally challenged, they would usually get impressed by trivial stuff, not very rewarding for people that value themselves. HR people couldn't be this dumb, they can't communicate with you because they don't understand anything since all they do all day is chit-chat, and eat, and get greasy fat. Boring environment, a lot of old folks hating their 30 yr job career at GM, very FRUSRATING.