At this point of the game, being โno weakerโ than the completely featless, hypothetical YC4 Snack is really not much to brag about.
The main reason why folk are disappointed in the Supernovas is not their lack of strength/feats but their lack of strength/feats in comparison to Luffy.
The Supernovas were introduced as the future rivals of Luffy. As it stands however, Pre-TS Luffy has achieved more than what every other Supernova combined has achieved within the last two years when Luffy went on hiatus.
Now, Post-TS Luffy is going to achieve more in two months than the rest of the Supernovas have achieved in two years.
Combine that with the Supernovas generally becoming Luffy allies that cannot achieve anything on their own merit without Lord Luffy to lead the way, Yonko bitches or seemingly turn out to not even be pirates (Lol Drake and Bonney the pseudo-revolutionary) and we have a group that absolutely fail at what they were introduced as i.e. to be rivals to Luffy.
The Supernovas never have been and likely never will be true rivals to Luffy, they are mere inconvenient stepping stones at best.