I'm not to that extreme because you need buy-in to make things work. But.... The problem with group think and committees is that everyone has a veto. The problem then is it is very hard to get out of Pareto Efficient [1] situations where advancing the group has to come at someone's expense. In these cases, someone owning the entire result needs to force the decision.

[1] http://en.wikipedia.org/wiki/Pareto_efficiency