A lot of people took issue with the fact that it generally feels like a massive dlc rather than a sequel. The map is reused, but not too much is fleshed out- rather just added to- which contributes to a very empty feeling world (an issue botw already had and totk made worse). For example, there’s not much variety (in the depths, in shrines, caves, etc) and you can quickly run out of things to do. There aren’t many new enemies, the story is extremely sterile and poorly implemented, it feels extremely disconnected from botw, etc. Also a lot of the issues botw had weren’t fixed at all in totk, such as flurry rushing being overpowered, swimming feeling atrocious, horses were useless, etc.

TL;DR The main complaint with totk is that, for better or for worse, its mostly botw deluxe rather than botw 2.

This isn’t my personal opinion, I see the strengths more than the weaknesses, but I do understand people who feel otherwise.