I'm really not too bothered. If the game is good and the graphics are semi-decent I'm happy. Never am I purchasing a game based on it's graphics. Infamous looked pretty spectacular when I played it for the first time (it was my first PS4 game) and I didn't even notice it looked ever so slightly downgraded (those screens make it look much worse than it actually is too - it's really a stunning game visually). All of Uncharted's images are bad examples of a 'downgrade', as all of UC's cutscenes are pre-rendered so it wasn't a case of downgrading in those scenes, they just made a weird decision of changing some of the scenery and lighting angles. Also, the first screen is not even the same location and if you look at the tree to the right in screen 2, you'll note the textures are pretty much of the same quality as screen 1, again it's just lighting differences. Again, Uncharted 1, 2 and 3 were pretty amazing visually when they first released, probably the best visuals ever seen in games at the time of their release.
Movies are advertised to be better than they are most of the time, toothpaste adverts make you believe you'll have sparkling white teeth after 1 use, shampoo commercials make you believe you'll have luscious locks etc etc. If everyone advertised their products as they really are/what you're really getting there would be substantially less sales. Developers can't necessarily be sure they won't be able to maintain the visuals they initially advertise, I'm sure they do try (some of them anyway), but at the end of the day they need to make sacrifices to ensure the best possible experience. I think it's really quite a stupid thing to complain about, especially if the game is amazing but just looks slightly different to how it looked when announced and then that's all anyone can focus on (Witcher 3 being the latest example). Nearly everything in the media is made out to be better than it actually is, I don't see why games should be the exclusion to the rule.
Long story short, if the game is as good as the trailers made be believe it would be (gameplay/experience-wise), I'm happy.