Wilson has started 10 games this season. Of those ten games, he posted passer ratings of 96 or better in six(!) of them. Only three times has he posted a passer rating well below the NFL median. Those three games were Arizona, St. Louis, and San Francisco.
Arizona was not a great game for Wilson, but it was also his very first game and in a very difficult situation.
The Rams game was actually a pretty decent game for Wilson, but his statistics were marred by three interceptions, all of which were unusual/fluke plays. It masked a performance where Wilson completed 68% of his passes.
The 49ers game was actually a great game for Wilson, but you'd never know it because of timely drops and tough breaks, including at least one dropped pass that might have been a touchdown. Wilson passed the eyeball test early on before the 49ers took the lead late and didn't look back.
So far, Wilson has had 6 fantastic games, 3 poor games, and 1 ordinary game (Carolina). And in all 3 of his poor games, Wilson was facing (at the time) a high ranked defense on the road and had tough breaks go against him that would have made a high passer rating almost impossible. In Arizona it was the non-existent pass protection. In St. Louis it was the bounce of the ball. In San Francisco it was drops. When Seattle has given Wilson decent protection, caught the ball, and avoided freaky turnovers, Wilson has very consistently played on an elite level.
A lot of people have talked about Seattle needed to prove themselves on the road. To that I'll just say this- stay out of Wilson's way and play respectable defense, and the road wins will take care of themselves.