Yeah, somehow that's become the real theme of the series - "Peter Parker as the ultimate underdog".
And yes, Peter's story can be that of the underdog up to a point. But underdog stories eventually tend to end with underdogs rising up, overcoming challenges, and being successful.
Spider-Man 2, still regarded by many as the best Spider-Man movie, was in many ways the ultimate under-dog Spider-Man story. But it ends with the underdog coming out on top. And whatever Spider-Man 3's other flaws, to its credit, it doesn't try to make Peter an underdog again but has him bask in his newfound success, even if it ends up being pride before a fall.
The MCU Spider-Man has flipped the script - he's never really been the underdog so far. So when NWH takes away everything from him and makes him the underdog for the first time, we're looking forward to seeing how he rises up again, stronger than ever. But you don't get that story when Spider-Man is perpetually an underdog.