No he didn't. And it's okay to say so.
It doesn't mean he won't get better.
Ok, X, so who on the offense DID play well? With the possible exception of Britt, seemingly every player on that side of the ball played poorly, based on expectations and prior performance.
The entire offense was a disaster; coaching, scheme, personnel, and execution. Boras was a poor choice for OC, and we couldn't find a better choice for a variety of reasons, including the probable perception that Fisher was a meddler and a lame duck. The scheme, as has been pointed out ad nauseam, was a "Frankenstein's Monster" (thanks Mack) of bits and pieces of different concepts, with impossibly long and convoluted verbiage, particularly when you factor in how maddeningly predictable it was. The decision to reshuffle the O-line right before the opener was a head scratcher, as was the incomprehensible mix of power and zone concepts. Execution was a disaster on all fronts, as the line failed to protect or open holes in the run game, Gurley suddenly lost vision and patience, receivers routinely ran incorrect and/or lazy routes, then failed to catch the football at an alarming rate. When things did go well, you could always count on a drive-killing (or TD nullifying) penalty to restore disorder.
And no, Goff did not play well. Aside from one half vs New Orleans, he looked like a beleaguered rookie. This was no surprise, given his "development". Why wasn't he getting first team reps from the get go? You want to develop a QB? Fine, stand pat and take Lynch, or continue to "develop" Mannion. This is what I can't understand; If your plan is to sit the rookie, only give him 2nd and 3rd team reps thru TC and pre-season, why move up to draft the guy? I could see the logic of this if he falls to you, sure. But if you're gonna give up all those picks, and you are SURE that he is the guy, you gotta go all in. Scheme the offense around him, what he does well, and gradually add things as he progresses.
I realized as I typed the above, that our coaching staff, in retrospect, probably wouldn't have been able to do all this anyway. It's a moot point, For better or worse, we are stuck with Goff for the near future, IMO, he has the physical tools to be a great QB. Whether he can absorb coaching and improve to that level is the question. If McVay could help Cousins become what he is today, he should work wonders for Goff.