If they didn't know Mazi was raw coming in, need major technique work, then yes, they are morons. It's been blatantly obvious. Mazi stands up at the snap, that is actually what you're seeing. Fix that, and the getting blown off the line and being slow off the snap goes away. A little hand work makes the lack of block shedding go away.
If you're disappointed at this point, then you maybe should've even be watching preseason. Will he come around? Don't know at this point. I would take a guess and say that they're having trouble getting him to play correctly, and so played him a ton to basically show him that how he's doing it is not going to work. And if he's still unwilling to correct, then he is a bust.