I play the campaigns, but I don't get into them as much as a lot of gamers. Some people read the books, play through the campaign over and over again for stupid achievements, thats what I meant. I don't play through a campaign and follow the storyline over multiple games(R1,2,3/Halo 1,2,3,reach, etc.). I've just always been an online first guy, and that's probably the reason why I'm not big on campaigns. The average age of a gamer is 35, so if you get online and hear a bunch of little kids yelling in your fucking ear you're doing it wrong. Figure out how to mute people and build a good friends list.
I'm a big fan of real weapons in games as well, the only sci fi shooter I've liked is Halo and that was because it was so balanced and competitive. I like military shooters because I can use weapons that I've either shot, own, or want to own.