My link also gives peak disapproval ratings. Obama is perfectly normal. W is an outlier, with a peak disapproval of 71%. Other than him, all the presidents since Ford had a peak disapproval of 54-60%. (Ford didn't have time to do anything to merit disapproval.) Obama is exactly in the middle. (Average disapproval is probably a better metric, though.)
Ford didn't have time to do anything to merit disapproval
Anecdotally, a lot of the anger came from him pardoning Nixon.
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