Okay, I apologize for being impolite.
I don't see the draft the same as you because above average offense could just as likely lead to below average WRs drafted. You could say the Patriots should have above average QB drafts since they have an above average passing game. But the last 15 drafts have yielded probably the worst QB draft in the NFL because none of those players could displace the starter. The same principle applies to all positions. Had they not traded for Moss they likely would have got more production from their drafted players, and had a worse team.
I think it's a fair assessment to compare Patriot WR picks vs the NFL as a whole in similar picks. In that comparison they come out around 1 of 4 in 2nd rounders. From what I see that's not the worst, closer to average. There's other ways to analyze the question, like how they use their draft stock overall but those will likely have the Patriots coming out higher since they continually have productive WRs.
One method that I think isn't very useful for analysis though is looking at who they drafted and saying player X was still available. That is true for every team. As is saying they had so many opportunities and hit less than some percent. Comparisons must compare. If all an analysis can conclude is the Patriots are terrible and so are 90% or 100% of teams it doesn't tell us much. If everyone's terrible nobody is. Or for that matter if ones method for grading terribleness includes half the teams in the NFL than it means the grading method is flawed, nothing more.
I'm going to have to fundamentally disagree with you. If you're going to utilize AV the way you are, you basically have to concede the fact that Tom Brady makes no tangible difference from an average QB since those 2 numbers are highly correlated. The Patriots are a strong outlier in offensive AV, everybody from Brady, to the offensive lineman, to veteran receivers and TE's tend to outperform their counterparts. The drafted receivers tend to be the most likely to perform closer to the average.
What you're saying is that a Patriots drafted receiver should perform similarly to that of an average offense and passing game. That is pretty much absurd, it's why the guy who did the breakdown by multiple teams saw that teams with stronger historical passing games tended to have stronger AV at the drafted receiver spot, and teams like the Lions who had Harrington, Orlovsky, and others for long stretches did not perform to the same level.
If you look at the context of the seasons surrounding our high round receiver drafts it's not like a majority of them were blocked by veteran receivers either. In fact many of the receivers we brought in through trade or free agency were in in response to our drafted receivers not performing to the level that they should in our offense.
A lot of time the simplest answer is the best answer. Take a step back and realize that Edelman is essentially the only receiver worth a damn that we've brought in during the last 10 years. Receiver has at times been a problem spot for us. It's a combination of both not picking the right guys, and not valuing the position.