There is a difference between looking like a third round rookie and looking as bad as Evans did. And even if he needs some time, if you pick a guy in the third round he should at least be able to contribute in some capacity in their first year, like being a backup if the need happens. Instead the Rams are starting a later pick and trading for other options. It's not to tough to get a read on.
Expectations...
But that is my point. You are not even giving him the first year. You are giving him 6 games (In which he hasn't played). Basically, what I am reading is that you think if a guy is drafted, and he isn't AT LEAST the first guy off the bench, immediately, he is a wasted draft pick. Sorry, I just completely disagree with that.
And yes, it is tough to get a read on. You generally can't judge a draft for 3 years, right? No matter how much YOU want instant results, it is TOO EARLY to judge a guy after 6 games. Period. You wanting results faster doesn't change that.
(EDIT) P.S. I am assuming, based on your standard, that you ABSOLUTELY HATED Goff at this point in his career. Six games in and The #1 Overall Pick in the draft couldn't even get on the field. And, he looked bad in the pre-season. I can't imagine how big of a bust you must have thought he was.