I think M.O. is way off base. Here are the real reasons Porter is worth every dime.
1) He has to be accounted for. Which our previous OLB's you couldn't say the same. I follow the Dolphins quite a bit myself being here in Fort Lauderdale and Joey isn't an all world player, but 9 sacks are 9 sacks. When he is on the field you better get him blocked, and even send double teams at him. And this opens up the field for Wilson, Campbell, and Dockett. You won't be able to measure Porters "success" by his numbers alone. You will have to look around the roster.
FINALLY: I am believing that getting our money's worth from Porter, will be of such little concern, that it will hardly register at all among the things on the Cards Richter Scale.
2) I am one who believes quite a bit in a players motivation, and Porter, coming into a system he is familiar with, is going to be in full on eff you mode. The Dolphins brass and fans have been killing this guy at every turn and I guarantee he will come out with a chip on his shoulder to proves he was right about not being needed to come off the field.
3) Our defense is big on rotating players. If we would have drafted a OLB we would then have two players whom in good reason we would have NO IDEA what to expect in Brown and rookie OLB. Especially from a liability perspective. That's not good. This way we can bring along Davis and Brown at their own pace and rotate them into situations that are going to maximize their success.
4) And this is most important to me. We can now address our draft not needing a OLB. With those first 4 picks we can truly go BPA at numerous positions which we all know is the best methodology for landing stars in the draft. Especially with Wiz and Kiem. This alone makes Porter worth every penny IMO.
5) What else were we going to spend the money on?
As a Seahawks fan its kind of bad form to think that you "happy" we signed an aging Porter. I like Whitehurst more then most but my cousin is a diehard Seahawk fan and is apolectic at the offseason so far. You aren't playing for next year. You are doing what Holmgren is doing in Cleveland. You are playing for 2012.
And Porter likely won't be on the team in 2012. So you'll have someone else to worry about at that point