A 50% reversal rate is normal so its not a stretch to say 40% - 60% is within reasonable expectations and not cause for alarm.
Recall that only appealed cases can be overturned so its already a skewed sample set.
A more informative figure would be # of reversals to total number of rulings.
And even that would be a little misleading because many reversals result from appeals where the defense realizes they screwed up and do a better job the 2nd time.
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