Brimstonei think the stormlight archive is one of the most polarizing fantasy series i know about that people regularly talk about in the space. I'm one of the people that love it.
there's folks who might get tired of the series as it goes in the way kermit said, but i had the opposite reaction where i got more invested as i got further thru the series.
i really like all the characters, the silly and the serious, i really like all their little interactions. In particular I like the interlude POVs of otherwise irrelevant or only loosely relevant characters that still have a place in the world, as to me they really give the world more meat and make it feel more lived in. I can definitely understand the viewpoint of those who want more tightly focused writing and dont want nearly as much fluff. I remember reading a note written by one of his former classmates and friends who mentioned sanderson had an issue early on before his writing career where he'd write endlessly of character interactions and sort of daily fluff stuff without ever having some sort of overarching plot. perhaps his affinity to caring more about characters/interactions than keeping tightly scheduled pace just doesn't vibe with people and that's ok.
many stories/arcs, whether they're standalone short stories or only loosely relevant stories within the interludes of the main series seem to me to just give the world more character. However again I know there are people who prefer much more focused stories without all the fluff.
on the other hand i think he's gotten pretty good at planning big things and mixing small twists in the plots. I think sanderson has become fond of building big the reveals, and in particular i felt like all various pieces coming together from far reaching parts of the cosmere has been fun to watch unfold, both in the explicit references as well as the more hidden easter eggs.
after finishing oathbringer i went to go read elantris, warbreaker, and several of the stories and essays from the arcanum unbounded book and it only cemented more how much i like how disparate each world's magic system feels, each internally logical, while still feeling like they mix well with the underlying workings of the bigger picture.
In the end though i think one of the biggest things for me is that i just happen to be someone that vibes with his characters, their interactions, and the changes many of them have go through. I never got the same sense of a character development coming out of nowhere, but i've basically had an uninterrupted go at it all, having started the series later than most i think.
i'm currently reading through dawnshard since i never got to it and then i'm going to finish wind and truth, which i actually already got maybe 20% into before deciding i wanted to finish dawnshard first. what i've read so far i've quite liked.
i think sanderson kinda just needs harsher editors
hes just too big and popular now, so he kinda just writes and writes. and thats good for the diehard fans that want as much content as possible, but for the average reader it just becomes harder and harder to enjoy. wat is so controversial with how bloated it is
sandersons best traits are his worldbuilding and plotting
his actual character writing and prose are lacking in some regards, but the sanderlanche style is very enjoyable once you get into it, and his worlds are interesting and feel lived in
i actually really liked yumi and the nightmare painter, its a shameless cheesy ya book, and its a lot shorter and cleaned up than his normal stuff.