I read part of the lengthy (and sloppy) article at the first link and thought, "no way in heck do I want to draft this guy--red flags all over the place".
The second, well-written, article made me respond, "well, maybe." I found these quotes to be very interesting:
Re: his talent
"He's one of the best receivers I've ever seen," said one AFC college scout who has extensive experience evaluating Green-Beckham. "He's special. He's gigantic; he has tremendous body control, balance; he runs like a deer and can leap out of the gym and high-point the ball. He's special. It's impressive. If not for all that stuff, he'd be the best receiver to come out since Calvin Johnson."
Now, the scout concedes that the 21-year-old is raw, and there is opposition to the rest of his assessment. Another AFC scout affirmed the Johnson comparison physically, but said, "He's not a slam dunk. He runs two routes." An NFC personnel executive added, "I wanna compare him to (Randy) Moss. ... I saw one play where he took off and dusted a corner, and said, 'He looks like Calvin.' But play in, play out, he doesn't play to Calvin's speed." An AFC exec argued that inconsistent hands and route-running keep Green-Beckham from that level.
Re: his character concerns--(two pot citations and an on campus incident in which he pushed an alleged female victim down a flight of stairs).
"He's very immature," said the first of the AFC scouts, having evaluated Green-Beckham closely. "People like him as a guy, but you cannot defend the off-field incidents."
One example of people liking Green-Beckham: Pinkel helped him find his next landing spot, vouching for him with his friend Bob Stoops at the University of Oklahoma. Green-Beckham transferred to Norman, with the Sooners hoping he'd obtain a waiver allowing him to play in 2014. When that effort failed, and the NCAA decided Green-Beckham had to sit a year in accordance to the transfer rules, many worried he'd revert to his old ways.
By all accounts, that didn't happen. According to the information gathered by a number of NFL evaluators, Green-Beckham walked the straight and narrow as, in essence, a very well-known practice-squader last fall. He was there for early-morning workouts, quickly established himself as a star on the practice field and planned to stay for the 2015 season. Those plans changed after the firing of co-offensive coordinator Jay Norvell, with whom Green-Beckham had built a strong relationship, but the gifted prospect was able to leave OU under much better circumstances than he did Mizzou.
Of course, the counter argument here is that it's not that difficult to behave for a few months with so much on the line.
And the question then becomes whether it's sustainable.