@Asros (don't really know who else to tag)
Seriously, has this ever been addressed? I'd estimate 95% of the time spent in a non-cosmic showdown is me sitting there watching these cutscenes, and that's not an exaggeration. I watch the first cutscene, drop warmachine in 2 seconds, watch second cutscene, drop black panther in 2 seconds, watch third cutscene, drop iron man in 2 seconds, watch one more cut scene. And I'm expected to sit through those cutscenes 669 times to finish the showdown achievement.
These really need to be skippable, or drastically shortened after the first time you've done the challenge.