The fact is that Brando's work elevates almost a third of the film into the mythic powerhouse that it's supposed to be. This wasn't obvious when it first opened, but it's pretty clear now. Does it really matter to anyone how he achieved his performance? Other actors are jealous and like to...
Brando's use of cue cards and other methods of seeing his lines was not laziness--it was a specific technique which served him well in many of his later films. You can't argue with his performances in The Godfather and Last Tango in Paris.