Thank you for sticking to the issue. Siemian had a slightly above average year at 8-6 (not 7-6), 10 of them with a serious injury. 

I do agree that we had a good defense although out of those last 10 games, the D gave up 23 to ATL, 21 to SD, 30 to OAK, 30 to KC, and 33 to KC - all losses. Siemian gave the Broncos the lead 4 times against KC and the defense gave it away 5 times, once in the final 15 seconds and once in OT. The D allowed KC to not only score a TD for the potential tie, they surrendered the 2pt conversion to force OT! Siemian's offense gained another lead in OT but the D failed to protect it - a pitiful performance by the D. Had the D showed up in that game, the Broncos would have made the playoffs.

The defense was also ranked 28th out of 32 in the league against the run. Not what I'd call "superb".  You may blame it all on a 1st year starting QB but I blame it on a poor team effort, especially the OL, which affected the RBs, TEs and yes, the QB performance.