I think Paul is only partially right. There is another side to this. It is the people that do ask a lot of questions that are usually more able to look at things from a different perspective and to be innovative. A man of action is great for getting things done but he (or she) will usually always do things the same old and usual way and not think much about what he is doing.

A more contemplative person will ask a lot of questions and figure out the problem in its entirety and then be able to test the boundaries and question the implicit assumptions.

I think a good team requires one of each, although having at least on man (or woman) of action for a team is important.