On the subject of unlevel tees, they may be fair for everyone, and they may not spoil an otherwise excellent golf course, but I've always been of the understanding that the tee is the one place on each hole where you are supposed to find optimum ball-striking conditions. What happens from there is your own fault.
If a green is sloped at such a pitch that a ball can't stay on it, it's the same for everyone; just as if a bowling alley is sloped to one side so that balls roll into the gutter, that's the same for everyone, too. There are degrees of this sort of thing. I'm not exactly arguing that golf be "fair," but there's always going to be an annoyance level beyond which most players would say it just isn't worth the bother.