Wow, that is kind of deep and harsh.I interpret this another way. It's more "It's the 50th anniversary! We need to do some sort of gimmick! Quick, think of something! Um...to hell with this, thinking is too hard! Let's just cross over 616 and Ultimate." It's not just a gimmick. It's downright lazy.
No good can ever come from Miles Morales entering 616. Ultimate is a dying universe full of dead characters, replacement characters, and horribly boring stories about how everything and everyone is screwed. It should never poison 616. Marvel said if they started resorting to crossovers between these two universes, that would mean they were out of ideas. And for an organization that calls themselves the House of Ideas, that's tantamount to just giving up.
The only reason Miles is popular is because he's replacing another character. If he was really all that great to begin with, he wouldn't need to replace anyone. He's like Tim Cook taking over for Steve Jobs. He's only notable due to association. No one will ever say that Cook will replace Steve Jobs fully. But Marvel thinks they can do it here with Miles and after reading the first few issues, I can't see how anyone would find this kid any more appealing than a rectal itch. He's boring. He has no personality. He has no wit. He has the facial expressions of a statue. No good can come from him crossing over into 616.
Ultimate is a cancerous tumor on the brain stem of Marvel comics. The sooner it gets cut out and killed, the better.