Not everyone has 8-16 friends that all buy the same game at the same time, I would assume most people don't. This is suppose to blur the lines of online and offline, but the offline(and online) AI is so bad I can tell the difference immediately. This game has to many flaws for all the hype it was given. I do like it however and will be playing it at least a couple of weeks.
I played with 2 others, a 3 man team, and we did just fine. But if your THAT anol and need a FULL team then go join a clan or post in the multiplayer forums asking for GT's to add and jump in their campaign games for exp. BUT by all means rant about your teammates not doing anything, or go play CoD with all the 12yo's who do NOTHING for the team as well.