i wanna say a long time ago on official sony site about the game they mentioned that you get bonus points for situations as well, like killin multiple bad guys with an m9 or something.
also dont sweat losing mvp to point whores, hell i lose it all the time from my suicides but the thing is...it doesnt matter, mvp is an ego thing, as long as you know you put some "work" in to help win thats all that matters. now when they change it to where you get extra points for your rank for mvp then well see, but until then let the point whores get mvp, i just laugh at ppl who do that and are 3-9 yet they brag about mvp in lobby...lol