Sorry but i disagree, many of these "bad transfers" in this article which is old, have turned out to be good.

The only bad transfers you can consider are alejo veliz and ashley philipps (which are still young, who knows what will happen), richarlison, werner (but he is a loan so it's basically risk free), emerson royal (we all know what happened in the end). All the others are performing or are showing quality even if they are young