It's not my cup of tea, but it's interesting, at least. And an improvement over the 2019-2022 GMCs (a low bar, for sure). It's not terrible, but I do have quibbles with several design elements.
I'm not a fan of the front end at all. Auto designers need to figure out what to do with what would be a grille on an ICE. Or, maybe I just need to get used to dorky looking solid grilles.
Vehicles that got the front-end wrong: this Denali, Mustang Mach-E, Tesla Models 3 and Y, Rivian R1T and R1S. Vehicles that got the mock-grille right: Tesla Models S and X, Hyundai Ioniq 6, VW ID 4, Honda Prologue, Ford F-150 Lightning. (That's not a comment on the overall styling of any of these vehicles, just my observation on vehicles that did, or did not, avoid dorky looking front-ends).
I like the integrated look of the Ram (including the digital dash of the 2023 models) better than the bolted-on-tablet look on this GMC. Alas, that tablet is popular, or at least common (Honda, Mazda, and many others do this to their cars and SUVs), so maybe this is another case of me being out-of-touch with current trends. Still, it looks to me like these screens were stuck on after the fact, rather than integrated into the overall interior design.
What I do find compelling about GM vehicles is Super Cruise. I've never been in a vehicle with it, but it at least sounds impressive.
One final thought: I find it ironic (and also, incidentally, implausible) that electric vehicles are being hailed as the saviors of the planet, yet increasingly, we get absurdly large and powerful vehicles like this Denali, the Hummer EV, and so on. Don't get me wrong, I'm all in favor of people having the freedom to drive what they want (so long as my tax dollars aren't subsidizing it, which fortunately, it looks so far like they will not do for this Denali), but if the planet needs electric or electrified vehicles (as proponents claim), then it needs more Honda Civic like vehicles, not multi-ton behemoths like this.
Then again, the industry is not yet ready (and I'm skeptical they ever will be) ready for full electrification, so if buyers with deep pockets fund the development of the technology for now, I've got no issue with that. That's how we got much of the automotive technology we take for granted today, airbags and anti-lock brakes being classic examples. But again, leave my tax dollars out of it; I have no interest in subsidizing any vehicles, and I especially do not want to help wealthy people buy extravagances.