The first two Transformers
movies were self-evidently crap, why should a third be worth a shit?
In fact, Revenge Of The Fallen
outperformed the first movie both domestically and worldwide. That militates against crediting good WOM from the first movie all that much, as you'd expect pretty massive falloff if the movie had really disappointed TF fans nearly as much as the squeaky wheels maintain.
And the notion that good will from one Pirates
movie has carried the franchise through three more
is a nonstarter. You explain an initial sales bump that way, not continued good business.