Xenoblade Chronicles 2. A sequel that took everything that was great about the original game and threw it out the window. Plenty of people have lampooned the juvenile writing, but that could have been forgiven if the game had actually been solid mechanically, however it was a complete mess on that part as well. The combat was dumbed down to mostly spamming QTEs and following an extremely linear elemental combo as your skill selection is very limited, hell you don't even fully unlock all the mechanics until like 80% into the game and at that point the game has long overstayed its welcome and you just want it to end. The game can't even fall back on its exploration being a strong suit as exploration is extremely disincentivized as they decided to populate aggressive over-leveled enemies off the beaten path with little to no reward for going there as most of your power is gated behind progressing the story. The zones are also much less impressive compared to the previous games and turn completely linear towards the end.
Then there is the awful ass blade gacha (in a single played game by the way) and field skills being tied to them. Good luck getting a proper team grinded out (and god forbid you want to actually get all of them) and backtracking for their skills and even after you manage all that the constant swapping around your loadout constantly to use their field skills.
Oh yeah and you can't jump in combat anymore because they must have fired all the competent devs.
There's probably more, but I've tried to block out my memories of the awful experience I had with the game. As it just feels insulting to call it a sequel when it's so clearly insulting to everything the previous game did.