Just read that Batman and Robin has topped Empire Magazine's worst movie of all time list.
The film rightly continues to haunt Clooney and Co. to this day.
B&R is bad, but if people are being honest there are at least a hundred worse films. All the Scary Movie sequels and their derivitives are far worse, as is (off the top of my head) Battlefield Earth, Hawk the Slayer and Norbit for instance. B&R offered the occasional eye candy, and there were few dead spots.
Don't get me wrong, I still think B&R sucks, but 'worst film of all time'? No, not really.