"Batman and Robin" is so bad that star George Clooney was happy to admit that the ruined franchise.
In all fairness to George, it was not ENTIRELY his fault, but his mugging turn as Batman/Bruce Wayne certainly didn't help. A heap of the responsibility falls on director Joel Schumacher, a usually reliable filmmaker who simply got too caught up in the film's spectacle.
After director Tim Burton made blockbusters out of the first and second chapters, Schumacher took the helm and made a respectable third film with "Batman Forever." But at the same time, every Hollywood headline-grabber HAD to have a role in a Batman film, and by the time "Batman and Robin" came out, the series became overcrowded with a "who's-who" in Hollywood cast.
Overacted and underwhelming, the film can only described, charitably, as an embarrassment.