Theres a lot to be said for getting it right in camera, however if you shoot raw format (the data from the sensor more or less untouched) you'll have to process the image, and even most jpegs will benifit from a minor sharpen/tweek.
Then theres the fact it's not always possible to get it right in camera, theres a lot of factors involved, the lighting, a grab shot, a difficult subject etc etc, even the best photographers will get it wrong sometimes.
Finally theres the creative side. I will often take a shot knowing it'll look totally different after I have "photoshoped" it, I'll sometimes know what I want before I shoot, other times I'll get the idea at a later stage.
Theres no right or wrong, if what you do works for you, thats fine, theres no rule that says you must edit.