The NFC West side, who have the best record in their conference, rank second on defense and eighth on special teams so far this season, but their offense is 15th.
The wide receiver told reporters: "We're 7-1 and the offense hasn't even found its rhythm yet. That's obviously a credit to our defense and special teams, but that's astounding for what we can be.
"Very frustrating. It's kind of hard to talk about it without saying too much. But offensively we were very disappointed. We left a lot of plays out on the field. We didn't execute some of the things that we are known for executing, and it wasn't us.
"If we can put it all together, once we get everybody healthy and the communication is there. Look out."
The Seahawks face the Tennessee Titans later today.