Favorite cases of when a fantasy series got to the point where it picked up immensly

Basically what I mean is that I wanted to discuss cases of novel series that started off slow at first as the writing comes off as ordinary, or rather simple, but then comes a point where once the series reaches a certain point, it becomes far more interesting because the writing aspects have improved as the saga gets to the point where it hooks in the reader.

I know the trope for that is called Growing the Beard, which is want I wanted to basically discuss as people here can feel free to discuss overlooked novels as while Malazan is hardly obscure, I often hear how it's a good example of the trope because some fans say the first one is alright, but kind of skippable, but the second one is where the saga becomes a lot more interesting in its worldbuilding aspects.