I would agree that industrious is far and away the strongest trait in mp (or sp).
As for the others I am pretty undecided, although I think expansionist should possibly be rated higher than joint 5th - espeically if played on a large pangea with raging barbs. Even on a continent if you get good luck (check Meli's luck in our game
) scouts can be a massive boost in the early game.
A lot of it relates to play style and map type. Militaristic is obviously most useful if your going to be warmongering from the start, whilst if each civ has an isolated start perhaps commercial would be more useful for uninterrupted empire building.