I'm only through the first two audition cities (who has two hours straight to devote to watching something like this!?), but I've already found a few that I thought should have gone on that didn't. Maybe Kaitlin's material just wasn't that good outside of what they showed on TV, but I sure liked what she did. Not at all impressed with Theo.
I guess the world of stand-up comedy is kind of like the world of homeless people... no one really knows what it's like unless you're in it (and sometimes, they overlap.