My main concern with GM (and a lot of American companies) is the peripheral.
But you're right, why can't they make a glovebox that dosn't pop open randomly or a headliner that doesn't rattle? Even though I haven't had any problems with CUE in my 18, I'm not and advanced user either. I don't have playlists, or favorites, and I don't use any Apps other than Radio, Nav,, and Climate. I've played with Carplay and Android Auto, as well as iTunes and playlists and use a 32gb flash because a Lexar 128 doesn't work consistently. If I keep the car, which I intend to do, I'll expect to "at least" replace the screen and If its post warranty I'll do the work myself.
The drivetrains are Solid for most models with The Turbo 4 seemingly the poorest in reliability. (my old '06 HHR 2.4L W/VVT has over 200k with no major problems and my daughter still drives it daily) GM's trucks and large SUV's can take you to 300k if you care for them and that's what you want. I have also seen 300k+ XTS's on eBay.
GM's Climate control is probably the best in the business and MagneRide, although not for me, has been licensed by some of the worlds hottest Supercars.
So far, in three months of ownership two of my peeves on the 18 XTS are:
1. I spent $150 on floor mats and the driver side wont stay on the positioning post (neither did the carpet ones the car came with). What genius came up with that? The mat hooks in my wife's Chrysler T&C work.
2. Why put the charging pad behind the CUE Panel, I always leave my phone. Even then, there could have been a warning that a phone is on the pad when exiting. You also must modify(cut) the insert to fit a large phone in 2018-19 again genius? How about no Ash Tray and a charging pad in its place. That would have been the right choice but once again genius.
To continue, the laziness and/or shortsightedness in American Automobile engineering is sometimes mind boggling. Like CUE, it would be so easy to use a standardized device (IOS or Android) for an infotainment system. Want to upgrade, pull the bezel off and put a replacement/upgrade in place, replace the bezel, download Apps, migrate settings and done! And they could charge for it! The owners would feel better because they got and upgrade instead of repairing 10 year old technology! I know that's simplistic and there are other complications but CUE? Or...License to third party's and create some competition. Think about being able to upgrade if Bose, Pioneer, or even Apple or Microsoft could compete for your GM dash...without using a hacksaw. I think I just had a 70's flashback!
All Auto brands have problems and some more than others. Just like all media the charts and lists are for dramatic effect and if you drill down there isn't much difference. I've become too cynical I guess, but when I read magazine reviews I always look to see which reviewed manufacturer has full page ads and wonder which came first, the revenue or the review.
I live in KY and the Camry and Avalon are made here, I still shudder when I see one as an "official" state vehicle, but would I buy one...probably never...and I've never owned an Oldsmobile either.
Anyway, in the immortal words of Forest Gump "That's all I got to say about that."