What are you going on about?
Yes, when Keaton was announced in the role, it was a laughing stock.
Then the film came out and many audience members' jaws dropped in awe at the dark look and gothic art direction.
And it became a huge hit, finally (largely) replacing pop culture's image of Batman as "POW! ZAP! HOLY CAMPINESS, BATMAN!"
You didn't like it. Okay. Does it hold up as a great movie? It never was great in my eyes. Yet you are painting it as a goofy romp by somebody that would just as soon put Batman in a dress(?), citing that it must have been an embarrassment to O'Neil, Miller, et. al. citing no evidence to that effect.