The top 7 first-person shooter storylines

Justin Kemppainen, Minnesota Games Examiner, writes:

The first-person shooter genre has never really been known for its rich storytelling tradition. Only in the recent generation has it become necessary to make up some manner of plot to give rhyme and reason to the endless slaughtering of monsters, aliens, and occasionally Germans.

Even then, many of the FPS games in the recent generation have tried very hard to incorporate it, and many times the offering is as laughable like Evil Dead (God bless Bruce Campbell). Every now and then, however, a blood n' guts shooter will feature a very surpisingly good storyline. Here are the best of them. Why seven? Why not!