Was there ever a reason given for why that is? At this point, Hamill IS The Joker. At least they secured the best Batman voice though.Shame no Hamill voice for the Joker
Play the Mortal Kombat story-mode. I hear it's really really good.
This man speaks the truth, although you really only get the most of it if you followed the storyline of the first 4 games, but preferably all of them just so you realize how amazing it really is and (spoiler)
how much of a cock-up it is for the living characters in any follow-up, now that Shinnok basically controls nearly every character because they're dead and now belong to Earth's Netherrealm. The whole thing plays out like a well-written tragedy. It's like Hamlet for gamers, in a way.
The only thing I think could have made the story mode even better was a small story addition to tell it from the bad guys' perspective, since there's lots that probably could have been told there, too. But that's a horribly minor quibble.