I don't think I've ever disagreed with any of Cosell's NFL observations. His NFL breakdowns are consistently great reads. They are incredibly informative... it's clear he knows what he's talking about with regards to established NFL players.
That said, the guy absolutely sucks at eyeing talent, pretty much 100% of the time. In the last five years I honestly can't think of a single prospect I hated that he liked and was wrong about.
And that's okay, we can't all be good at everything. I think what English is getting at is that there are a lot of people out there who worship at the altar of Cosell come draft time, without realizing how completely awful his track record in the draft has been.
Regarding Lindley, he was the same QB in college that he's been in the pros, one of the worst QBs I've ever seen that got draft hype. Every now and then, there's a bad prospect who makes good like Andy Dalton or Nick Foles, but Lindley was way below their level, IMO.
I think the reason that Cosell is so bad at evaluation is because he appears to be the type of guy that believes the draft is purely luck based. If you subscribe to this concept, then you wouldn't look for the best QBs, but rather for the QBs with the best traits in the most important areas and hope to get lucky. Basically, he is the perfect opposite of John Schneider, who follows some physical criteria but generally searches for players with high end intangibles first and foremost.