I think part of the reason it hit me so hard is that Ridley seemed to still be on top of his game as of a couple years ago, I didn't see him as a director who was over the hill or seemed to be on a real downslide. I've loved most of his 2000's output, Black Hawk Down was great, Kingdom of Heaven was great, even as recently as American Gangster I thought he was doing really good work, and that was only 5 years ago. These are movies with strong thru-lines that effectively juggle large casts, so to see him suddenly make such a vast mis-step (in a genre he largely defined as we think of today) just seems so out of the blue, like WTF?
I guess Body of Lies and Robin Hood should've been warning signs, but the former was still decent, and the latter had a troubled production and started out as a much more interesting movie, so those never jumped out as failures to me particularly.