Not really surprising. Hollywood lives to make things "gritty" and more "realistic" these days. Hell a gigantic genetically designed creature capable of sending out a psionic wave that kills most of the people in New York could never fit in a film with a blue naked dude that has the power to do about anything.
That's just it. I think the big, blue, naked demigod that vacations on Mars is more than enough of a fantastic element for moviegoers. Piling on a gigantic alien squid with psionic powers would be too much. In fact, I thought it was too much in the graphic novel and I couldn't be happier with what they came up with instead.