I still think it's a great feat to go and face the main villain on the island despite your fear and being way weaker than they are.
I mean, I would love a PU for Usopp so he'd stop being a bum, but Usopp's character was never about that.
I've watched his fight against Ms Valentine in LA, and while he got beaten badly, he saved his friends, and it was a good look on him.