Unfortunately that’s not the norm. I’m sure there’s good and bad ones and all in between. Glad you have a good one. Myself, I’ve never had a vehicle under GM’s warranty because I’d rather buy something used and make it into something I want to drive without anybody to tell me I can’t do this or that or my warranty will be void. So I have no use for them anyway. There’s zero I would trust them to do to my vehicles.I was thinking back trying to remember if I ever had a "bad" experience in a dealer service department and besides perhaps paying $1.50 for a $1 job, I can't say I have. Here in Boise, I use the local GMC dealer service department from time to time and they have been more than great. In fact, I can say for certain they have saved me thousands working with GM NA. In addition, they charge $25 for an oil/filter change. The only reason I don't use them for oil changes is I prefer WIX filters (Napa). I am certain other people have the polar opposite to say about them, but I am certain the crap Bill had to put up with wouldn't happen at the local GMC dealer here.
I know for a fact my anecdotes don't represent the norm (just based on credible people here), but I would just say, I don't think they ALL are bad or don't care what I think about the service. Hell, they badger me constantly to "know how they did", when I go in for something.
The one thing I really tried to work with them was her $1500 (each) headlights that spiderwebbed like crazy on her Cruze and they said it wasn’t covered under the bumper to bumper warranty. Headlights were exclusively written into the warranty as an item not covered. But they said they would work with us with GM customer service to get them paid for. It went on for 2 months and their final offer was 40% off list price but the service dept had to do the work, and labor was like $600-800 because the front of the car (bumper etc) had to come off. So it was still about $2500 to do both. I ended up buying used ones that looked perfect and replaced them myself for $500. I don’t remember them asking me how they did, there wasn’t much doubt lol. Out of my only 2 experiences with them, it couldn’t have been much worse both times.