For me, a lot of this discussion about party size in other RPGs misses the point. My strong preference for six is very specific to this game, because this is a D&D game. When an RPG's system has very few "classes" and/or classes are weak or nonexistent, then a party size of four is fine (ex. Dragon Age, D:OS). But when you have a very deep and robust class system with a large number of uniquely-defined classes and then even subclasses and archtypes and the like, as you do in D&D, a party size of four is extremely limiting in my ability to fully enjoy that deep and robust class system. So it is very specifically with a party-based D&D game that I want and expect that larger party size.
