DB is inconsistent.
In the TOP we have Omen 1 < 2 < 3, where Goku's normal forms increase significantly with each use. In case you forget, Omen 1 was likened to the Super Spirit Bomb used by SSBKKx20 Goku, and Kefla was compared to that, yet SSB/SSBKK Goku was able to fight with her. After Omen 2 and repeatedly getting stomped by Jiren, Goku's normal forms increased even further.
Then we have Whis's initial statements of suppressed Jiren being > GoDs.
Point is, considering all of these details, MUI alone is at least dozens of times stronger than fusion-tier characters (Kefla), who is at least 20x stronger than the Spirit Bomb Goku used on Jiren, yet by Goku's own words, Broly is only "maybe even stronger than Beerus".
By that logic, Broly in any of his forms should've been curbstomped by any form of standard Super Saiyan, probably even in base, considering base Goku fared much better than SSG Vegeta.
The only way that statement makes sense is if Goku was referring to Broly's base form, otherwise that would mean SSB Gogeta is only around Beerus's level when the TOP statements and fusion directly contradicts that.
There's also Golden Frieza surviving for approximately 2? hours against Broly who's supposedly maybe GoD level, and getting one-shotted by suppressed Jiren in almost every instance.
As it stands, MUI Goku stomps.