Why did BG1 chose to have 6 chars? Since then lots of people think every RPG must have a party of 6. ( see this thread ).
As far as I know, PnP DnD has been designed for 4 players plus 1 DM.
I have played several computer RPGs with different party sizes. I liked most of them and some were bad, but the party size was never the main factor why I liked or disliked a game. The main problem with party size were games with way more party members than active party members and the ones who are not in the party do not gain exp. This means grinding for dungeons were you need several different active groups or when you need a specific char for one area or quest. I never finished Final Fantasy 6 because I hated grinding when some late game dungeons require several active parties at once.
Prof. Dr. Dr. Mad S. Tist
World leading expert of artificial stupidity. Because there are too many people who work on artificial intelligence already