The "hate" (I don't hate him at all) is a direct reaction to the movement who had him in the MVP conversation and are overrating him. "So, so bad" was an exaggeration but he simply is not a good QB in my view, not even top 15 while loads of people in the media and social media are placing him way higher, undeservedly so imo. There really was a reason why he was the last pick in his draft.
"He took over when it mattered", "he won them the game while Lamar is 2-4 in the playoffs", the hyperboles are just too much. For each stat category he's 1st in and people like to point at, I can easily give a counter-example of e.g. how the Niners are head and shoulders above the rest in the league in scheming players open. He has a lot of INT-worthy throws that inexplicably get dropped by DBs, in both of their games in the playoffs now as well. His best throw yesterday hit a Lions DB in the face, his first 5 throws were 2 tipped balls and one that should've been intercepted.
He has the best RB in the game, one of the best route runners in the game, one of the best offensive HCs in the game, one of the best TEs in the game, one of the best LTs in the game, a WR/RB hybrid that regularly breaks the first 2-3 tackles aimed at him, and a stellar defense with All-Pros supporting him. This Niners team is absolutely stacked, even moreso than the 2020 version reaching the SB. Jimmy G is as average a QB as they come and they had them with a double-digit lead into the 4th quarter if I'm not mistaken. And once again the Niners are riding a bang average QB to the Super Bowl. The end result is all that matters of course but they escaped against the Packers and that sequence last night where they Lions dropped a ball on 4th down instead of taking a FG, then the lucky Aiyuk catch which should've been a game-sealing INT, then a botched hand-off leading to a fumble deep into the Lions own half, ... You make your own luck but I sincerely hope the Chiefs will execute better than that with a genuine quality QB leading them.
I'm biased as I really dislike the Niners but I dislike them because of all the undeserved praise Purdy received this season, I wasn't a believer beforehand and I'm definitely not a believer after watching him perform in the playoffs these last two weeks.