It was more like...half of a season tbh. his first full starting season, after that SB, he wasn't very good. He came on in the middle of that great SF team and no team really had sufficient time to deal with him. There really wasn't tape.
I certainly don't think he was the worst QB in the league and definitely deserved a shot on several shit teams, even as a low-tier starter, but I always felt he was massively, massively overrated, even when he first came in and was putting up bizarre numbers. He just...didn't have the brains for it. Incredibly athletic and gifted with certain skills, but pro QBing requires more brains for the game than Kaep every showed.
I had much more respect for his protest movement and honestly value him much more for that. He totally got rail-roaded by a bunch of racist crybaby billiionaire owners, listening to their snowflake racist fans.