Now with the confirmed appearance Doomsday being in the movie there has been discussion saying it's too soon and I personally disagree. We know Batman and Superman can't fight forever. The subtitle of the movie is Dawn of Justice for a reason.
HE'S NOT A REAL CHARACTER
Doomsday is purely just a mindless killing machine. He is not the type of character you can build an entire film around. He is basically all brawns and no brain. He's just a plot device that was used to kill Superman because Superman comics weren't selling back in the 90s. Having him be the threat that unites Batman, Superman and Wonder Woman is a perfect idea. Doomsday is not Darkseid or Brainiac so having him appear in Batman v Superman is really no problem.
HE FITS THE SCALE OF THIS MOVIE
IT MAKES SENSE FROM A STORY PERSPECTIVE
Also, from a story perspective it makes the most sense seeing how Lex obviously has Zod's body in his hands. It also makes sense as Lex wants something that could go toe to toe with Superman so he cooks up Doomsday from Zod's body. From a story perspective Doomsday makes the most sense in this film and fits in the overall picture.
HE IS THE TYPE OF CHARACTER THAT DOESN'T STAY DEAD
The one thing about Doomsday is he always comes back and you can never defeat him the same way before. Now I know what I said before about you can't center a movie around Doomsday as he just too one-dimensional but you could possibly bring him back for a Justice League movie or adapt "The Death of Superman" storyline in the Man of Steel sequel.
Anways, that's my perspective so let me know your thoughts. Do you agree or disagree?