as for the Nas picks bad beats talk (which is 100% valid), it's that you have these artists who aren't as good lyrically who pick these beats that so sonically pleasing that it enhances the replay value of what shoulda been mediocre projects (Fat Joe is the patron saint of this). You just wish Nas would get those beats, so when Nas is working with those producers and he doesn't pick those kind of beats, you start having to assess blame. It's usually either Nas or Salaam Remi (since he overlooks a lot of his projects). Because Nas is such an icon, you'd think he can choose any beat he wants, so don't settle for weak shyt. The last 2 projects have been Nas trying to do with that with particular producers (I think everyone turned out to be dead wrong about what a Nas /Kanye project could bring even though I still maintain that Nas shoulda fought someone over those Daytona beats). This time, Hit-Boy delivered a happy compromise to those who want Nas on grandiose Justice League shyt and those who have no problem with Nas' ear.
So maybe it's not that he picks bad beats (none more than the average, especially Hov). It's that Nas misses the most opportunities to pick great ones.