While raids and the crucible allow for 6 to be on a team, story missions, strikes and exploration only allow 3. Personally, I feel that this is too small. A lot of us have more people we like to play with and are also just used to playing in groups of 4 or more in co-op games. As far as game difficulty goes, I can only think of two times where an increased fireteam size might be an issue. That's during strikes and areas of story missions where spawning is restricted. I'm assuming this game has some sort of ability to scale the difficulty to the number of players since you can go in alone for story missions. What do you guys think?