I don't have a problem with any party size, but I have a huge problem with your group of more than three becoming three people. FFX did an okay job with it because you could call anyone in at any time, and in Suikoden it makes sense, but usually it's just pretty retarded.

I don't especially see why six people is especially harder to balance than three or four. We're assuming so because we're used to three and four as the standard, but Suikoden has six people and does just fine.