I don't think any FPS has a story as lame as that.
MW2's campaign was just
*kill sheperd*
"LOL END"
-insert loving long credits here-
The forget?
The ending isn't "LOL END", you're just loving stupid. No stuff killing Shepard was the end, it was the amalgamation of all the previous plot points leading up to it, but if you didn't have Aspergers/ADD you would have noticed that. The story is fine, it's actually really clever. As for the end, it's called a cliffhanger. Actually it was barely a cliffhanger because you already resolved the final plot point, plus the ending had the same structure as CoD4. The only reason you're calling it out is because you're a bandwagoning dipstuff and don't have any valid points of your own, so you need to confabulate some.