That's the problem.
Every fan is ultimately optimistic that the players their team gets will be good even if they wouldn't have been their choice. But if you're going to claim to be analytically inclined, you have to consider that the analytics were always against the guy and they pointed to almost certain bust after the debacle of a season he put up last year. But still, even today, there is hope for Robinson. It's slim, but it exists. Maybe it's hope for him at OG or maybe that he'll eventually learn to play the pro style version of football that he never was exposed to prior to entering the NFL. But, of course, by then it will likely be too late for the Rams and that is always the danger in expending such scare resources as high draft picks on physically talented QB's and OT's that you're going to have to develop almost from scratch once you get them on an NFL team. All we can do is hope Goff isn't yet the next hard lesson the Rams and their fans have to learn in this respect.
In baseball prospect evaluation parlance, the comps simply did not favor Robinson as a good bet with that significant of an investment even if the underwear olympic process of evaluation did. Didn't favor Smith or Bradford and doesn't favor Goff either. It's not a death sentence, but it does mean it's going to require a rather rare exception to hit and right now that's what we're left hoping for with Goff.
For me it's never been a contest about who's right and wrong. Even the very best are going to have plenty of failures in such a natural environment of high uncertainty and volatility. And sometimes even the worst are going to get a hit now and then. For me it's always been about the Risk / Reward Analysis and process. Did you follow a good one but still missed? No problem, try again. Did you ignore that in favor of a pull and pray based approach and fail? That's a problem.