I do agree that ND should be scolded for that initial reveal trailer. They duped people, and it is very bad form. I'm actually disappointed in ND for it. That said, gameplay reveal wise things have actually been graphically improved from demo's to final reveal, and I do think that the cutscene and gameplay model is the same, the difference being that ND likely changed initially higher quality cutscene models, to instead the gameplay model for added consistency. Playing the game, because of the smooth transitions it's clear the cutscene and gameplay models are the same, only it's the lighting that sometimes changes.
Overall though, Drake's model looks great, even in gameplay. And yes lighting can make all the difference. Not to mention because he's always moving about, it's hard to get a tack sharp shot.