I think people need to understand the rules before they complain about excessive contact down the field.
If you notice, the Seahawks don't get a lot of sacks but the DO force the opposing QB out of the pocket quite often. This may also have a lot to do with the specific QB matchups the Seahawks have had this year.
Once the QB breaks the pocket (moves beyond an imaginary line drawn lengthwise down the field where the OT's were lined up), the illegal contact rule evaporates.
At that point, the CB can push/block/shove the receiver at will, until the point a forward pass is thrown to the receiver.
For an example of smart CB play, check this play
where the CB pushed the receiver out of bounds before the pass was thrown, making the receiver ineligible for the rest of the play. If you were watching the game and listening to the announcers, you would be completely convinced that the replacement refs blew a crucial call. In reality, the call was correct.
Remember the offsetting personal foul called on (Browner?, I think) when he knocked Greg Jennings down near the end of a play in Week 3? Bogus call - that was a perfectly legal block resulting in a knockdown. Our CB can't help it if the receiver isn't looking and can't take a legal hit like a man. When Jennings went after the CB after the play was over that should have been a penalty on Green Bay alone.
Similar plays occurred consistently in the Redskins game. The Redskins receivers were whining for flags all game, but RG3 was out of the pocket every time. The refs, correctly, did not throw flags.
So when you see a Seahawk CB pushing/shoving/blocking a receiver downfield, don't fall into the ignorant announcers' trap and think that such conduct is automatically a rules violation.