I've watched it again...so here are some better breakdowns:
His footwork and pocket presence are exactly what you want from a quarterback. Reminds me a lot of Ben Roethlisberger in the way he navigates the pocket and uses his stature to breakthrough arm tackles. That said, his mechanics on routes that go over the middle of the field leave a lot to be desired. This manifests in the number of passes thrown behind crossers or slant routes. His ability to throw deep out cutting routes is impressive though. He had a few of those throws that looked bad but I think his receiver didn't play the back shoulder throw like he anticipated. He does love that back shoulder comeback almost to a fault.
As a passer, he bodes well for most of our favorites for downfield explosive passes. He's got the arm to push it to the sideline off corner routes and comebacks. Not much sample size but I assume is ability to throw a post pattern over the middle of the field is similarly adept. I'm concerned with his ability to execute some of our possession passing concepts like crossing routes and slants. That is probably his weakest area as a passer.
He's more of a runner than people give him credit. He's not Tebow, Newton, Manziel, or Marshall quality but he is good enough that I think you have to put a few QB runs in the gameplan to keep in your back pocket for the right moment. FSU ran a shotgun counter trey for him at one point, several zone reads where he had the green light to keep it, and one or two QB draws. You don't call stuff like that unless you see him as some measure of a quality QB runner. He's an above average athlete for the position but not quite elite. Certainly, I'm not saying he'd get even 5 designed carries per game but he's more of a threat to keep it than any recent QB because he's got the size to take some hits and probably just fast enough to make it a worthwhile call. I could see us giving him a read keep green light a few times a game and maybe even had a designed run if they see something in the defense. Definitely something to keep the defense honest or give them one more issue to deal with against the run.
All and all, I can see why some like him but he's not a slam dunk. Blake Sims probably has some advantages over him through experience with our players but the new coordinator will likely even that out a bit for all starting QB competitors. He's clearly a better deep ball passer than Sims with each having about the same amount of opportunity last year to demonstrate their ability. Sims is more a running threat because he's faster but Coker has a bit more of a build to take SEC defense hits. It's a real push.