Blame Cam all you want (and he does deserve some of the blame) but I put a lot more on McDaniels.
The play-calling was absolutely atrocious all game long. Save for the first 2 weeks of the season, McD's play-calling has been terrible for the better part of a year, going back to last season. You have a 6'3", 215lb WR and you can't throw one single, f*cking fade/back-shoulder throw? You know, the ones Cam is good at throwing?
McDaniels gets stuck in a certain type of play-calling and has no nuance/tact in adjusting. Take away what he does well and he has no alternatives. Today they tried to run the read option, once that got shut-down they had no alternative plan for running the ball. They tried quick hitters in the flat, but the DEN DEs were all over batting those down. And after that, he fell into a long-developing, downfield passing attack with an injured o-line.
Infuriating - absolutely should've won that game.