Is it possible to create your own server on the Xbox 360?
You cannot make your own servers hosted from your local xbox, the reason for this and the six player minimum is because of cheaters. A lot of people stat pad, or find methods of getting points quickly and effortlessly to rank up. It was a massive problem in Battlefield 2 and is still a problem in BF3. EA claims they went through and wiped accounts that showed signs of cheating, but I still see players with rediculous ranks, so they failed.