Not really complaining about Jiren's power as much I am complaining about the way they wrote this, they made big fuss over the UI Omen then it lose to Jinre because incomplete and ran out of time, okay cool, then we wait for 20+ for the rematch, we had to put up with all the SSB vs Jiren BS while knowing fully it won't pay off even if they fight him for years
Then the true rematch begin, Goku can fight Jiren head on and even get the upper hand with UI Omen, the BS start with MUI asspull, it was totally out of place and not just that, he also lost anyway to Jiren, just what was the point of White Hair Goku? yeah selling more figures but besides that?
Giving Goku a lot of asspulls power-ups and losing to Jiren, again and again, doesn't make Goku look any good either, I know some people will try to defend this by saying oh they don't go the shounne route by having the main character win but this been the case for every damn arc in super
Having your MC lose every fight doesn't stand for good writing either, especially when you hype his ass to the moon