When the trailer for the newest Metroid Prime game, Federation, a lot of Metroid fans weren't so happy about it. Calling it a black sheep, worse than Other M, and not worthy to be a Metroid game. However, Metroid Prime producer Kensuke Tanabe, told Ign about not only why this game exists, but also build up something else. Remember the ending of Prime 3? Well most of you people thought it was one of the bounty hunters from Hunters, and Kensuke confirmed that the ship and the hunter in it was none other than...
Sylux, Samus and the Federation's biggest enemy.
Then he also confirms that Federation Force to be a spinoff to flesh out the story and the universe before making another Prime game. Kensuke wanted to build the story around Sylux and Samus.
So why the hate? They're planning to make another Prime game that people really wanted after Prime 3.