Seriously, the fact that the same guys saying "Chip Kelly's offense doesn't work in the NFL" (when it clearly does) are the ones saying Mariotta isn't anything special. Not really lending any credence to the argument. Either of them.
And anyone spewing this "one read" mess has absolutely no clue. The offense Oregon (and to a lesser extent Philly) use is about pre-snap reads. Once the ball is snapped you go into your option read. It a much simpler offense for a QB to run (pun intended). That's not a bad thing, its a good thing. Mariotta is a better athlete and passer than RGIII so those comparisons are ridiculous.
I see a smaller, faster Cam Newton.
I don't even know how anyone can watch Mariotta and think anything other than he is a special player. He has a cannon for an arm, great size, tremendous instincts, blazing speed and he is a good decision maker.
All that said, I still wouldn't be willing to give up what they would have to to take him top 5 or even top 10. However, if he slides out of the top-10 it's very doable for them without sacrificing the whole draft.