Well, it seems in the article they mostly mention how character models, notably ghouls, and animations seem to be pretty recycled as well as some items in the game world. I don't know how true this is. The article could have been misleading, but that was the writers impression, which isn't much, but we don't have much else to go by...
The game itself graphically does appear to be an improvement, but not a whole lot, which makes me think they focused heavily on plot and world design more than impressive graphics, which I would be fine with.
I wonder what the authors expectations were though. Maybe he expected cutting-edge visuals and graphical upgrades. I probably was too in the beginning. My question is how better is the combat in this game vs the previous. The combat in NV and 3 were just atrocious. Probably some of the worst I've seen lol. I'm not even joking. I was pretty glad to hear that they got some help from Bungie in this department. I hope they made it a lot more smooth this time around.