Jack, you are right. I have been amazed, too. Paul and Dave - I can appreciate your point of view.
I think the hardest thing for people to accept is when they've already paid alot of money - perhaps as much as they can afford - and then find it's been done wrong. That's a hard pill to swallow. Having purchased two new houses where the master showers were done wrong and they failed a few years later (no, I was NOT involved in the construction of either one), I now realize you can't trust someone just because they're a licensed contractor! Lots of people apparently haven't learned that painful lesson yet, and they're still hiring hacks as a result.
My shower in my current house has been taken care of beautifully and correctly - thanks to the info on this site, which helped me select a tile setter who knows what he's doing. I'm hoping that with the advice here, the backsplash I'm planning to do myself will turn out just as well!