i love it because i can write programs to move my money around. I can stream payments with https://sablier.finance i can lend and borrow with https://aave.com I get paid universal basic income each hour from https://www.proofofhumanity.id I use https://yearn.finance/ and https://app.pooltogether.com/ as my savings accounts.
I can take a loan against my collateral with https://alchemix.fi/ to buy things irl. I have a https://monolith.xyz/ visa card to pay for things with my crypto (until bridges arrive).
I can organise with others in https://app.daohaus.club/ and vote in https://snapshot.org/
At what point have we satisfied your criteria for making something useful and successful? I use it everyday, it works great for me.
(all of the above is just a small set of projects on ethereum)