Board Thread:General Discussion/@comment-30406012-20180212163452/@comment-34363146-20180212180045

Jiren is just the best example of a huge problem that plagued super from start to finish in my opinion: They showed most enemies to be way too overpowered way too early (Goku Black holding his own against SSJ Blue Vegeta in his base form, Frieza catching up to god level in mere months, fused Zamasu being immortal, Toppo defeating Golden Frieza in an instant, Jiren not even breaking a sweat after battling Goku and Vegeta in their new forms etc), so they had to come up with asspull transformations and power-ups like Rage/Spirit Sword Trunks or Ultra Blue Vegeta just to balance things out.

Goku mastering Ultra Instict, a technique which not even Beerus (and by assumption most if not all of the other Gods of Destruction) has mastered completely, over the span of not even an hour is a major asspull, for sure, but it's the only way they could end this arc after all this build up.