I'm a Volt owner since 2018. It really depends on your locale. Some dealers won't acknowledge repairs covered under some warranties (for the Volt, there's a 30000 bumper to bumper and 100000 mile for the hybrid components), escalating to Corporate about service issues at dealers (they have a lemon law phone number) will give you a lot of runaround. You'll probably find sales pressure tactics with every dealer. I suggest checking the subreddits for a particular model to get a feel for the post-purchase experience.
That said, GM did send out a marketing survey last year that was geared towards determining what customers want from their purchasing experience, asking which among Amazon, Apple, etc, customers would prefer in different aspects.
When I tried to by my stick shift colorado in 2015 a dealer in the bay area flat out said they didn't make it. He refused to check. Why would I call and go there and try to convince them if it didn't exist?
I drove two hours to Dublin and bought it from there...
The service was terrible too. I took my vehicle there a few times for an interior noise and the service department responses switched from "yeah we fixed that" to "what noise? it doesn't make any noise" and so on.
Interestingly, if you bought a 2022 model (for 6k more) chevy are offering you a cheque for 6k, provided you promise not to join the class action lawsuit about the older models.
Are Chevy dealers particularly bad? It’s not clear from the article.