Almost all the action in the movie takes place in the desolate landscape that is Planet Zero, and while that's just fine for the accident scene itself, it's a pretty bland locale in which to stage the final set-piece in particular. Where's the visual majesty that defines the genre's most memorable movies: The Avengers' Battle of New York, for one? Above all else, there aren't as many stakes if the action is set in some empty, barren wasteland, and though a couple of cars and trees from Earth do get sucked into Doom's black hole, there's just no palpable sense of danger for humanity. Why should the audience give a damn? Setting a battle between Doom and the Four on Earth would enhance the sense of peril hugely, and provide a more visually interesting setting for some carnage. Maybe have Doom blow up some skyscrapers and cause the scale of mayhem you typically expect from a comic book movie of this kind. Again, scaling-up the budget would absolutely allow for this.