My two are Morrowind, where I loved the quest design and lack of handholding, but the random hit chance and BS difficulty distribution were just... too much to handle.
And also, KOTOR, which I expected to love as a huge Star Wars fan, but the "stand around while dice are rolled" combat was just... exceptionally boring and tedious.
Pretty happy about it honestly. He's been counting down to this for ages in his newsletter, so it's far from a blindside on my end.
I've preferred much of his "second channel" content for a while now anyways, and I suspect we'll see lots of interesting content outside of the boundaries of "things you may not know".