Some people hoped that Galactus would wipe out Ultimate Earth, citing Seasonal Rot as a reason, and hoping Marvel starts over (which would be the result, given Galactus' nature). Given the universe's Darkness-Induced Audience Apathy nature it's understandable why people would rather root for Galactus to destroy the universe than have a collection of designated heroes continue to live there.
Citation needed on that one. I have searched a bit about this in the internet. I found pages that criticised it and compared it desfavourably with the first Ultimate comics, I found refences about people who incorrectly thought that this arc was meant to end the Ultimate Universe, but I did not found a reference about this weird reception stated here, about fans wanting Galactus to win and end the Ultimate line.
Citation needed on that one. I have searched a bit about this in the internet. I found pages that criticised it and compared it desfavourably with the first Ultimate comics, I found refences about people who incorrectly thought that this arc was meant to end the Ultimate Universe, but I did not found a reference about this weird reception stated here, about fans wanting Galactus to win and end the Ultimate line.
Ultimate Secret Wars