Buy a game and elite membership, you'd expect more effort put towards keeping it a fair competition. I can understand it's difficult to keep hackers out but when it's this obvious then not doing anything is simply negligent.

i haved the same problem, i started losing 1000 places a day and when i checked the leaderboards i see people with a score per minute of 1,000,000 with little caps kills and defends.  Here is the email i sent

Hi i play mw3 on ps3 all the time, mainly playing in the core domination lobby. i think i made it to under 1000th place and then all of a sudden i started losing about a thousand places a day.  Upon looking at the leaderboard i see a lot of the people have little to no captures kills or deaths?  how is this possible? and if they have used hacks to get there score up why have they not been removed to show who the real leaders are?

If i am missing something here please let me know as i liked my position,  thankfully i havent lost to hackers my killrank wich is now in the 300's

1	BLACK-WOLF-991	1,106,277.70	1,431	1,035	1,398	332
2	SnipeKid96	535,736.88	5,900	4,054	548	472
3	PhiLASof	89,417.88	26,451	24,883	3,705	2,489
4	bandar-1ksa	71,701.22	20,139	24,121	4,087	2,723
5	KirbyLight	17,750.91	128,665	62,608	12,597	12,790
6	FlashyShots	490,758.63	2,918	2,433	243	295
7	hardscope54	88,346.18	19,461	14,269	2,640	1,570
8	FloosieGus_xD	59,092.07	33,261	16,812	1,822	3,038
9	LilHeadshot97	317,364.68	5,583	2,071	875	561
10	hack--evil	386,150.77	1,346	2,751	840	174

end email

it could be possible for the multi million dollar company to make script or bot to watch the leaderboards and flag unrealistic figures such as these and other stats like accuracy, damage, headshots and more.  but thats just my thought.