ARice89 pretty much summed up everything I was going to say in thread. While not being arrogant toward the OP, you really need to know a little bit more about the Wings defense aside from Lidstrom before making a comparison. On paper, the matchup isn't even close. That's not to say the Pens won't find a way to score a goal or two, but the type of game the Pens play falls right into the hands of the way Detroit wins games. In all due respect, if you honestly feel Detroit only has a slight advantage on defense due to Lidstrom, then you don't much about the Pens' potential opponent.
I was just going to say, on paper it's not even close (knock on wood); Gonchar would be Detroit's number four. However, the Penguins do play impressive team defense -- more impressive than they get credit for, IMO. People seem to think they are all offense but from what I have seen that's not the case. Overall though, I don't think there's a team in the league that can match Detroit's defensemen or their forwards' dedication to defense.
Another thing to remember is the fact that Lidstrom is only averaging 25 minutes per game so far in the playoffs...and the Wings are still dominating teams. You can bet that Nick will be matching up with Crosby and Malkin for at least 30 minutes a game in the finals. Seems to me Babcock has been saving Nick for the most important games.
Another thing that I pointed out on another forum: the Penguins were dead last this year in faceoff percentage. That doesn't bode well for them. To me, Pittsburgh is similar to Colorado in this regard. Who takes the puck away from the Wings? The Wings have been excellent in the faceoff department all year while Pittsburgh has been weak. Pittsburgh obviously has loads of skill, but where are the shutdown forwards and defensemen? Is Hal Gill really going to strip Datsyuk of the puck?
A lot of Pittsburgh's game is waiting for the other team to screw up and capitalize on turnovers -- which was essentially how Dallas was playing prior to this series.
Edit: I think we'll be seeing a lot of my avatar in this series.