When did I say the Gorosei weren't top tiers? I'm saying being Big Mom 2.0 ain't a good thing. She's a meme for a reason, and these dudes are becoming memes themselves. There's a complete lack of respect for them, this was not the case with Kizaru earlier this arc.
Big Mom was not threatening at all, and neither are these guys rn. I wouldn't be worried if Chopper and Robin were fighting Big Mom, I just knew they'd pull through on their own somehow, maybe slap her and Robin rolls her out like a carpet. Whereas if Chopper, Jimbei, Sanji etc. were together, I would question how they can keep Kizaru company for even a second given how he can walk past these dudes.
The Gorosei don't even look like jokes, it's just Oda's usual plot that is holding them back. Comparing them to Big Mom is just plain dumb.
Luffy, Dorry, and Brogy were running away from Warcury
Atlas had to sacrifice herself to allow the SHs to escape from Nusjuro
Luffy, Bonney, Sanji, and Franky all had to team up just to send Mars away
The Iron Giant had to come in and stop Warcury from attacking the Giants ship
If Oda decided to have the Gorosei go all out, everyone would pretty much be killed.
If this arc was about defeating the Gorosei then alright I can understand them being jokes, but this arc isn't about fighting and defeating them, it's about escaping from them.