Number 10: Darryl Kile (19 OPS+, 148 plate appearances)
The late Darryl Kile struggled as a pitcher with the Colorado Rockies.
In his two seasons as a Rockie, he hit .203/.252/.244 with an OPS+ of 19. His best season at the plate was 1998 as he hit .254/.293/.324 with an OPS+ of 50.
He never had another season with an OPS+ above 14 so that may have partially come from the “Coors” effect.
Number 9: Tyler Chatwood (22 OPS+, 183 plate appearances)
This one of the few surprises that I had during the research of this. In five seasons as a Rockie, Tyler Chatwood hit .209/.238/.241 in 183 appearances with an OPS+ of 22.
His best season at the plate was the season that he had the most plate appearances as in 2013, he had 45 plate appearances and he hit .300/.333/.325 with an OPS+ of 72.
In 2012, he had an OPS+ of 55 but no other season was above 12.