Around the midpoint of the series, Luffy's DF started to look weak in comparison to the abilities of other top tiers, which then became a predominant sentiment in the OP community. And if we have the opinion that a rubber body is not a strong power, then this is still true right now – only the reputation of the fruit changed in the last chapter, not the substance.
However, Oda never presented Luffy's powers as weak or a disadvantaged. On the contrary, when Luffy ate the GGF in chapter 1, it was a great treasure of the sea. And then Luffy proceeded to go through the East Blue smacking down a bunch of villains who had no superpower (except Buggy). People would hit Luffy as hard as they could and Luffy would smile back at them saying that he was rubber, so their attacks were meaningless. These rubber powers just put Luffy above everybody else -- and that's the angle from which Oda made us look at the power at the start of the series. Later, in the Grand Line, some enemies started to belittle rubber, but Luffy would scream back at them for it. Metaphorically, rubber was what made Luffy bounce back, what made him the natural enemy of a God, and the ability was a machine for brawling and physical superiority as long as Luffy put in the work.
What made the GGF compelling was not its supposed inferiority, but its whackyness and creative appeal for choreography. In the words of Oda, it is a ridiculous power. And this is essentially true for the Hito Hito no Mi, Mythical Type, Model Nika – it's the same fruit. Even the Awakening is the same thing, but more whacky and ridiculous.
Agreed. But rather than renaming the fruit and it's genre, Oda could have simply said that GGF was the fruit of Nika/JB used 800 years ago