I disagree about games that have guns in it do not have 'style'. I mean, early Shinobi games had tons of guns and amazing art, but the later releases had less guns and significantly worse art at times! Halo, for instance has had a ton of really just outstanding art sometimes. Did you ever beat Halo 3? That has some of the most beautiful effects and art I have seen in a game since Panzer Dragoon Orta.
Even bland stuff like Killzone has nice art at times. Did you ever see the menu designs in Killzone 2 for instance? Shit, it might be worth playing just for the awesome menus! I mean, it all comes down to gameplay at the end of the day, and even like the ugliest games ever can be fun, while some of the prettiest games can be completely annoying and not worth anyones time.
One of my favorite games ever is the original DOOM, and that game is so fucking brown that it actually bothers my eyes after awhile. I do not see how something like this has worse art than Call of Duty games.
On the topic of Call of Duty games, ignore the shitty ones by Treyarch as this may be what you are focusing on unintentionally, the titles made by Infinity Ward are fucking outstanding though and have excellent art (not a joke, seriously just check it out!).
EDIT: I agree with Eastside on the art of inFAMOUS 2 though. :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: