There is another factor that played into the Ravens loss last night that is kind of joked about, but Peyton's record and Flacco's record speak for themselves. It was a regular season game and Peyton Manning is without peer during the regular season and Joe Flacco is just another good quarterback.
Had it been a post-season game, I believe that the Ravens win and Joe continues his good play in post-season and Peyton adds to his futility in the post-season (save the super bowl year)
Say what you will, the pundits eschew any criticism of Peyton for his post-season failure, because they like him and his regular season numbers will be the best ever. But, to accumulate a sub-500 W-L record in the post season means you get there a lot (great regular season) and lose early (post-season futility). You can only lose 1 game in any post season, but you can win up to 4. So, if you play well one year (Peyton did) you should have a pretty good post-season record (see Joe Flacco) and Peyton doesn't.
I'll take Joe (9-4) over Peyton (9-11, 8 one and dones) in the post-season and that's weird to say, but based on Peyton's 15 or 16 years of results and Joe's 5 years of results, it's the prudent option, IMO. Of course, 10 years from now, Joe might be 9-11 as well, but who knows.