This is actually a pretty small group considering they're going to fight some endgame type boss content.
7 is also a really weird number.
Most MMOs have parties of 4-6 and raid groups of 8, 16, 20, or larger.

I am excited for some actual group combat, though. Fighting the floor bosses in Aincrad was always pretty awesome, but we only really got to see 3 bosses (1, 74, and 75) and Kirito solo'd one of them.