One thing that certainly gives the books some color, but which I just can't manage to accept (I don't remember if the TV series touched on this) is the problems wizards have around electronics... lights blow out, AC dies, sophisticated electronics crash, etc.
It's not that I have a logic problem about it--I mean, we're talking about wizards and magic--I just can't believe that the Wizard's Guild hasn't figured out how to cast some spell that prevents them from shorting out complex electronics everywhere they go, so they aren't forced to live like Druids in the modern world, or repelling all of their non-magic friends ("Get away from me! My cellphone hates you! Back off!").
And do I believe these most powerful beings would be content riding around in 50-year-old cars?