Ultimate Comics: Doomsday - Brian Michael Bendis

I really love the Ultimate line. Sure I had problems with some of the titles and some of the plots/characters, I think everyone did. Doomsday, however, just causes questions. What the hell is Bendis thinking? What is he trying to do? I just don't see the point of the comic. The reason behind the Ultimate line was to reboot the Marvel universe to bring in new readers, not to throw everything into chaos and rewrite the personalities and motivations of so many characters. Why does Bendis feel he needs to undermine the Fantastic Four and cause even more destruction to NYC? I just can't figure it out.