To me anyone who doesn't like the matchup might just be afraid because it's Seattle and we have some bad recent memories against them, which I understand.
Green Bay matches up fantastically against Seattle compared to Philly, and this is coming from someone who hasn't been optimistic about this team at all. Philly's offensive line can take over a game. If Wentz had played, he could have potentially carved us up especially with two really good TEs. They also stop the run far better than Seattle and get to the quarterback far more often.
Seattle is the opposite, their offensive line is atrocious. The Smiths should have a field day, and Seattle doesn't have any runnings backs to keep you honest with play action, which really plays into our hands. They have a couple solid receivers, but we have good enough corners to match. They dont have TEs like Ertz and Goedert that could give Blake Martinez fits in coverage. On the other side, they also can't stop the run, which is our offensive strength.
None of this is any guarantee of victory-- still have to go out and execute. But if we lose, it won't be because the matchup stunk. This is about as good of a matchup as you can have this late in the year.