I've seen a lot of great QB's since 58 - - too many to list. The really great ones had quick minds that matched or even exceeded their physical skills.
IMHO, BigPete & AO are spot-on in their assessments.
Martinez has a low ceiling (at QB) because he makes too many mental errors, doesn't see things. He is a skilled athlete and could be very good at several positions of need (Safety, Outside Linebacker, Flanker, etc.). Think about all the low passes that normally will go uncaught (today was an exception). Think about all the passes that were dropped because he hasn't learned how to slow the pass down for short range . . . those things kill an offense against good teams.
I like the young man, but we risk much by having him at #1 QB. For 2019, overall, our best QB may be Vedral, followed by Luke M, then AM. In 2020, we may hopefully have more options (we would be an instant contender if we had a McKenzie type of QB).