I don't think we're near as big of a dog as most seem to think, nor we were as big of a favorite as most seem to think we should have been over the Bills. Bills, Pats and now the Packers I had as coin flips before the season and I stand by that. A coin flip is not great for a home team however, the Seahawks would have to be about a 90% favorite on average at home, maybe even against elite teams. Nor does a coin flip mean it'll be a competitive game necessarily, it simply means that if we played them 10 times in this situation we'd probably win 5 of them.
Vegas has us at ~42% fwiw.
It's not so much where Vegas has us, but how we match up in our ability to pass and defend the pass. We haven't been very good (the game vs the Raiders makes our numbers look a lot better honestly) in either facet of the game, whereas the Packers have excelled in both.