It's not that surprising that the team was flat. After playing well after Giguere's outburst everyones attention is elsewhere and Oilers have figured out that all they need to do is be patient and counter attack against Avs.
Avs carried play for the most part but mistakes crept back in, especially on the defensive side. That, a poor power play and a Varlamov that didn't have a great game was enough.
If I had to make a prediction of how I thought the game would play out and put it in a sealed envelope before the game, my prediction would have been quite accurate.
Hopefully there is more mental sharpness against the Blues.