Scoring in S&D is low because of scorestreaks. If they kept it at 500 points per kill, you would get a Swarm with four kills.
^ In search and destroy in MW2, scoring 1000 in a game was considered excellent, yet one kill appeared on your screen as 500 points. Was that simply related to XP? I feel as though the flawed scoring systen for search was either an oversight or due to either laziness or indifference concerning score per minute.
F2000 was an unholy weapon. Respect it, and it harvested souls for you. Treat it like the mortal SCAR-H, and it would devour you.