"I used it to great effect in a bar brawl once."
My opinion is - you were lucky.
https://www.youtube.com/watch?v=0KUXTC8g_pk
I don't know the guy from the video but I think his assessment is very honest and balanced.
Could you explain why? I have quite a bit of experience with Z80 and x86 (16bit) assembly. I remember that I've tried to learn 6502 many years ago but lost interest after a while. I remember that 6502 didn't feel superior to me then, quite opposite.