by MonkeyMagic
In addition to the "no right answer" element, I think the simultaneous action selection also help prevent a single player dominating.
In most co-op game each player takes a turn and all attention will be focused on what they are going to do with their precious turn and everyone will chip in with advice. In RC there is a bit of general discussion about what needs to be achieved on a given turn but in the end you all have to plop down your two pawns on the board at the same time. It is much easier for players to be autonomous and decide early on "I'm doing X, the rest of you can sort out the other stuff you think is so important", or when placing later "while you guys do all that, I'm doing X".
It has become my favourite co-op, although actually because I think it is a very interesting and thematic game, rather than for the above reasons.