I've seen tons of him as my older brother was a former RB and coach on the staff at Wake. I know that people on this board are vastly overrating him because of his experience and numbers in that Wake "slow mesh" offense. He is a very good college player with limited upside. He actually DOESN'T have a strong arm but it's above average, The GOOD he is accurate on short (screen and swings) to medium (post corner) range throws. Best traits are on short routes putting the ball in position for YAC and those middle range seam throws. I love his fiery demanor too even though he has toned it down a bit since Soph year.
For the BAD, well undersized listed at 6'1 210 but is same height as me 6'0" and closer to 205 so he is in that Book mold. If flushed he tends to throw the ball up carelessly and without the great arm talent ball to drive the ball leads to INTs (25 last 2 years). OVERALL ACCURACY (59% for career) Deep throws will sink and come up short as he doesn't drive the ball and throws more of a looping ball. Oddly struggles to sense pressure despite having very good footwork and took alot of unnecessary sacks.
But i'm guessing people prefer Hartman since he has 1yr of eligibility over the better talent in Card because he has 3 to play 2. I can see him being in the Coan range for us as a QB with more mobility but certainly less accuracy.