Treyarch actually did a good job on the campaign. Its a bit over the top and at times seemed like they were trying to hard with certain aspects with so much going on (it is an epileptics nightmare
) but job well done. Its hard to explain, some areas of the game are absolutely gorgeous and others environments look a bit cheap. However, the facial graphics/expressions are the best in the series and an improvement from past games. Overall. Great gun selection, cool missions, interesting story a few slight frame rate slowdowns. I do agree with the sentiment that IW games have a more polished feel to them. COD4 still is my favorite campaign.
Now its time for Veteran. It is going to be a nightmare because Treyarch decided to bring back infinite re-spawns in some areas of the game. When it comes to playing on Veteran, "it's always better to be lucky than good".