Receiving stats are definitely down so far this season or they are more evenly dispersed as compared to last season, and seasons prior to that.
To illustrate this in 2017
twenty players have 40 or more receptions this year. Keenan Allen is one of those players. In
2016 after the first 9 weeks 43 players had 40 or more receptions.
Total receptions for players above 40 in 2017 is 888 receptions. In 2016 total receptions for players above 40 was 2045 receptions.
That is a huge difference. Twice as many players had averaged 5 receptions or more per game (40) as this season and the total receptions were more than twice as many.
So while Allens numbers may not look that good compared to last year (around the 35th-40th player at this point last season) he does have the 16th most receptions this year. Those numbers are more valuable in a relative sense this year than fantasy owners may be accustomed to.
Maybe the above is too extreme as the sample does have more players with 9 games played than have been played this year. So looking at the first 8 weeks instead, 28 players have 40 or more receptions last year, eight more than this year. and total receptions for players above 40 was 1319. Still significantly more than this season.
2016 was a down year for receiver stats compared to 2014-2015. The trend is down.
Reasons for this I would speculate being worse QB play and improved defensive play across the NFL. More throws to players other than WR (spreading the ball around) and slightly more rushing attempts. Right now each team is averaging 26.7 rushing attempts per game while last season it was 26 per game. Some of the best WR being injured, such as OBJ, Robinson.
Anyhow Keenan Allen is very valuable in a relative sense this season, although the numbers do not match up to previous seasons. He is tied for 11th in terms of total receptions with Hill, Evans, Garcon and Hill has one more game played than Allen does.
Folks are talking about benching a top 12 WR because of the bad match up and benching him for players who are really risky starts. That doesn't make much sense to me when Allen is one of the few truly consistent WR plays so far this season that overall is down and does not provide better options.
eta on a per game basis pass attempts are down 1.4 per game, completions are down 1.1 and yards are down 14.2