I forced myself to watch through the first season of Breaking Bad, the second was meh, but starting from the third and until the end it became the best series I ever watched. The same happend to a friend, he wanted to stop watching, I told him to go on and at the end he loved it.

Better Call Saul also got better as episodes went on.

The Foundation series had terrible pacing in the first season, and they massively improved on that in the second.