@captain_inverse: "You don’t want to belittle the actual antagonist of the film, which is Ronan. You don’t want him to seem like a big wussy. We’ve had the Other, who’s obviously very powerful even in comparison to Loki, and then we see Ronan wipe his ass with him."
MCU vibranium isn't strong enough to stop Doomsday. Besides, Ultron just isn't strong enough. Doomsday took on DCEU Superman and Wonder Woman, and a case could be made that either of these characters could solo the MCU Avengers (who beat Ultron). Plus, Doomsday took a nuke and survived. Nuke = Citybuster, so Doomsday took a city busting attack and survived.