It isn't as simple for me as saying he didn't have a great OC or a great supporting cast. Goff had a lot of his own issues in year one that he really corrected in year two.
He was in a spread offense in college that never asked him to huddle or play under center. He didn't make good reads or work through his progressions. He held the ball too long and didn't drive through his passes. He got happy feet too often and that led to erratic passes.
Much like the Ravens this year, a better supporting cast wouldn't fix that. Goff had to learn to play in the NFL. It's a really big jump that he wasn't prepared for and it showed.
The only game I watched of him last year really was against the Seahawks and despite the offense not doing anything I thought he did what he could and played pretty well. His OL just didn't give him time to settle, there was no running game for the defense to respect and his receivers dropped half a dozen of passes in the game.
If you're referring to my posts in the Joe Flacco thread, I'm not defending his play, but whatever people want to hope for he'll still be there next year and probably the year after that. It is what it is. He isn't a good QB and hasn't been since his playoff run. But there has been a guy named Gary Kubiak who has unveiled a very simple way to maximize his qualities and minimize his flaws. Flacco is a very rigid QB. He can't work in a system that isn't designed for everyone. He can work only in a Play Action, Bootleg based offense. On the rare occasions we've run this type of plays we've seen (at least I did) a very clear difference.
I'll stop there as it is off subject.