The top 10 of these Power Rankings are getting harder and harder to fill out every week, and that's due to the high number of mediocre-to-bad teams in the NFL right now.

Each week this season, it has grown tougher and tougher to pick teams worthy of a top-10 spot in the Power Rankings but easier and easier to fill out the bottom spots. The bloated number of teams that are mediocre-at-best is likely a huge part of why the NFL's TV ratings are falling this season.

The AFC has it worse than the NFC through six weeks, with 15 of 16 teams in the former already saddled by at least two losses. The playoffs are still well off in the distance, but the current list of true contenders is short.

Here’s how everyone falls after Week 6, and we'll start it from the bottom this time:

32. San Francisco 49ers

PREVIOUS: 32

RECORD: 1-5

Not since 1972 had the 49ers allowed an opponent to rush for 300 yards until the Bills rolled up 312 on Sunday. While that LeSean McCoy-led performance skewed the overall numbers a bit, it’s entirely possible that this goes down as the worst run defense in 49ers history when all is said and done.