Bangladeshis are pretty humble and decent people from my experience. I think Bangladesh's recent successes stem from the fact that they, out of the South Asian countries, have most closely studied the East Asian model of industrialization and thus, have focused on building those labor intensive industries that served as the foundation of East Asian development for decades. It is a sound model.
Obviously, Bangladesh is just getting started and it still has overwhelming poverty, but if it continues on this path, it will become a successful country.
The other thing you need to consider is that BD is a single-ethnic country unlike India and Pakistan. It simply does not have to worry about keeping itself together like the other two need to.
BD had half the per capita nominal of both Pakistan and Indian in 2007. For 2021 the numbers are as below in US dollars:
1. Bangadesh : 2500
2. India : 2200
3: Pakistan: 1500
Yes, both Pakistanis and Indians are still richer than BD'shis due to historical higher per capita but we can see the different economic trajactories easily here between BD and India/Pakistan.