Portnoy is definitely the leader of the band. Not in the same way that Steven Wilson is for PT, for example, as he is not THE or even A dominant songwriter, but when it comes to direction, touring, set lists, CD/DVD releases, dealing with the record company, etc., I thought it went without saying that Portnoy was the unquestioned leader. I think the control freak in him has to have it that way, and I am sure the others love not having to deal with all of that.
Anyway, to answer the question, I would say a 5/10.