LAX is one of my "home" airports - and although not great, I really don't see it as all that bad. True, the airport itself is crap, but the United Terminal 6 experience, at least to me, isn't that bad.
I usually check in in <5 min and usually wait <5 min for security.
I stare at the line of people waiting OUTSIDE the southwest terminal every time I pass by. I've been in that line once - and it isn't pretty.
And I agree - trying to compare almost any US domestic airport to an "internaltional" airport is apples and oranges. Shouldn't be that way - but it is. The domestic flight experience has been getting worst well before 9/11.
Billy