It was the first mission that had me pausing to just enjoy the scenery multiple times. It was seriously just so gorgeous and quite action-packed and compelling too. I nearly lost my stomach when my character jumped down that waterfall into the pool below. They really nailed swimming in this COD and I love how you can shoot underwater. That's going to be a feature in multiplayer as well.
There are so many awesome moments in this campaign, some of which I didn't even show. It's really worth playing if you plan on getting MWII for the multiplayer. Don't skip the singleplayer this year!