Not sure all QPR fans did warn us about him to be honest. Don't get me wrong, he was shocking for us. But some of their fans, at the time he signed, thought he was decent, but they just had better.
Similar to Bettinelli (didn't he make an England squad at one point?) we seemed to pick him up at exactly the wrong time. Previously decent to good, but on a seemingly downward trajectory. Can't see him coming back from it despite being relatively young.
Strange position goalkeeper. Theoretically you can play at a top level well into your 30s. But there's loads of examples of keepers just losing form and dropping a level in their 20s. Joe Hart, Paul Robinson, Chris Kirkland, Jack Butland being high profile examples.
Be a good article for the athletic or a podcast for Ben Foster as to why it happens.