A good color means natural. Look carefully at a fistful of hair in the mirror. See how each strand has a different tone? Perhaps even different colors on one strand? These are the natural striations that Mother Nature gives each head of hair to work with natural lighting. A good "color job" must duplicate these natural highlights to be effective.
That's not to say you're going to duplicate the salon experience at home any time soon exactly. But it also doesn't mean the over the bathroom sink approach can't be more enjoyable, or pleasant even, now does it?In other words we've come a long way, baby when it comes to coloring our hair.