I haven’t seen it but I heard that they made Galactus into a planet-sized cloud, instead of the huge, planet-eating, armor-wearing humanoid that he is.

WTF???
The cloud is more of a manifestation of Galactus’ power than anything else. Galactus’ true essence is deep inside the cloud where he appears to be a being made of cosmic fire and energy. In the last battle, you briefly see a shadowy outline of Galactus’ form in the shape of his head and his famous helmet from the comic books.