Well yeah when 99% of the leveling game is based on single player, they have to do it that way.
This game really only turns into an MMO when you hit 50 and start ops, even then 8 and 16ppl "raids" is pretty un-MMO like compared to my past MMO experiences. Which is kindof a bummer considering how little there is to do at that point.
I almost wish every major change in a class story or chapter required 4+ people to complete.