I'd challenge Dallas, NE, Jets, and Tampa. IMO he played average to below average in all those games.
See, we went 3-1 in those five games. During the season it TRIGGERED people when he was criticized for those games.
If you go back and watch every throw from a neutral perspective, you can't say he was "good" in any of those games except Tampa. And the problem with the Tampa game for me is the two awful INTs that turned what should have been a blowout into a nail biter. And a ton of his yards were YAC gained by Woods and Kupp.
Dallas he was the definition of "meh". NE he was outright bad even though we won by 21 points. Terrible INT and was inaccurate.
Even though Blythe was awful against the Jets, Goff was too. Both those things can be true. We have another inexcusable INT there.
The worst part of the Goff saga last year was that those of us who truly felt unbiased - that is, we thought Goff was great in 2017 and 2018 - got a lot of flack for criticizing his play in games that we won. If a WR drops 7 passes in a game but we win, the forum does not rush to defend him. And just because the team won, I wouldn't want to be that WR when the coaches review film of that game.
Here's another problem - he wasn't necessarily bad in all those games. He definitely wasn't bad against Tampa (good offset by the bar INTs to be an average performance to me, same with Dallas). But I expect him to be better than that. The only games where he met my expectations - and I'd guess McVay would be even tougher to please because he has high standards - would be Washington, Buffalo, Arizona, Seattle (first), Philly, Green Bay, Chicago