"If 5 people in room always agree, then clearly that room is clearly not filled with intelligent people."

This turns out to be not the case, if by "intelligent" you'll allow me to substitute "rational." People who are rational and honest should always agree:

http://hanson.gmu.edu/deceive.pdf

And, also:

http://www.overcomingbias.com/2006/12/agreeing_to_agr.html