I evaluate Tua based on his skill set and how it meshes with the things a modern NFL QB is asked to do, how I evaluate every player.
I also don't hold Tua blameless for our offense, we are using a lot of his Alabama concepts offensively, so he's basically causing us to run a college offense. Or the staff didn't trust him to run a normal playbook, whatever the case is, the RPO will always be a short passing game offense for the most part. You can take chances, but by its very nature it's not built to exploit the deep intermediate and deep portions of the field in the NFL.
I'm willing to roll with Tua another year though with improvements to coaching and the offense.
I'm not saying he can't succeed, I'm just being honest in how I view his skill set.