I agree. That's probably the hardest job to consistently do well and there are a lot of bad comics out there.
I don't know if stand up comedy is ever that funny for comedians. To them it is a job, a performance. Their jokes are rehearsed, planned and memorised. The stories and the rhythmic flow from one joke to the next is a carefully constructed sequence. The meaning behind a lot of the humour is often dark, sad and angry. I imagine being a comedian is something like a cross between an author, a performance artist and a sociologist. It is the meaning in comedy that makes it valuable, not just the quick-reaction laughs.
They laughed when I said I wanted to be a comedian. Well, nobody's laughing now!