It is stupid, I repeat - stupid, to simply look at just the stats of first 4 games on a QBs career. Especially, one that was expected to sit and learn because they're raw, but were forced in due to injury.
He had 4 games, three as a rookie, and one his 2nd year. He had about an 84 passer rating. That's way better than a TON of QBs, even high profile QBs who had great careers.
His 1st game, he had a 117 passer rating - he actually came in midway through this game, so really it's only a 3.5 game sample size. His 3rd Game, he has 116 passer rating. Right off the bat, that's 50% of his games with 116 or higher passer rating, with 4 TDs to 1 Int.
The team also wasn't as stacked as it is now. There was no CMac. Mostert was on IR. Aiyuk was just a second year guy that was only solid. They were 3-5 to start the season. Don't tell me that's because of Lance and his 1.5 games (They were already losing when he came in the first game, and they put up more points with him than Jimmy G).
Fact: It's foolish to take a 3.5 game sample size and pretend it means much of anything for a QB coming into the league.
Fact: It is even more foolish to do that with an extremely raw rookie who needs time to learn.
Fact: Contrary to what you like to pretend, it is not all bad, and there is definitely some good mixed in.