I think the biggest problem with the yukon denali is the price point. People pay 70k plus for a vehicle and expect a 70k+ experience when in reality it is just a 50k tahoe with fancier options. I believe it is GMs fault marketing it to consumers as anything other than what it really is. I'd recommend the LX500 series of SUVs for a better consumer experience.
It's up the buyer to determine whether the additional price is worth the value. A friend of mine has a Suburban and I have the corresponding Yukon XL Denali, and while they're the same truck underneath, it's a pretty big difference in the interior materials (seat leather, dash wood, gauge cluster, console, door cards, etc).
If someone is buying a GMC for a luxury dealer experience they're making a mistake (See below)
Exactly. Well said. GMC is marketed as a luxury vehicle without the luxury consumer experience. I'm not sure how things are on the cadillac side, but I'm sure it is similar.
The local Cadillac dealer here is a better experience - I'll call it quasi-luxury - than the GMC and Chevy dealers, which are equivalent IMO. I also lump Toyota in with them as well, just a generic type experience.
None of them hold a candle to Lexus while having products that cost more. If Lexus sold a SUV I liked, or pickup I could tow with, I'd never buy GM again.