some interesting tables at the link.
9th is bad in many ways - but not always the worst.
ABA is source so read with caution
Table 2 to the cited ABA article shows 8 cases reversed and 1 case vacated from the 9th Circuit. The next most is 6. So the 9th Circuit had 33% more cases reversed or vacated than the next worst Circuit. And the Federal Circuit, cited as as bad or worse than the 9th Circuit, had 2 cases reversed.