At the time he was signed, this seemed to have the potential to be quite a good move for the Diamondbacks. It looked like another case of Mike Hazen picking up a reliever with experience as a closer, without having to pay current closer prices. Rondon had 92 saves over seven seasons, including fifteen as recently as 2018 while with the Astros. With a career ERA+ of 125 coming in, getting him for a relative song had appeal, and the general reaction on the SnakePit at the time of the news seemed moderately positive.
However, this contract will end up being filed in the growing pile of sucky veteran relievers to have passed through Arizona in the last few years.