Note: The following is based off of interviews and tweets. So it's not based on much.
ET and Wagner both strike me as quiet. Friendly and social, don't get me wrong, but they're not Ray Lewis. Both seem to be "lead by example" types, though. You need those type of guys to be great players.
Red is probably the most vocal leader. Sherman brings the swagger the same way Giacomini brings the toughness. I agree that we could use some additional leadership here, but I don't think that leadership is a weakness on D.
Sarlacc, on comparing .NET to Soccer: And why not? It's a bunch of people running around in circles, feigning pain, and never scoring.