I believe 'show, don't tell' is good advice, but for me it means, 'show when possible, don't tell if you can't make it interesting'. Narration, of course, is an important part of writing, and there are ways to use it to draw readers in. Narration as internal dialogue is one way, as is having action occur in any narration. It can be great for teasing what is to come, or in adding to the characterization or posing questions and curiosity in the reader's mind. In the end, for me it is about balance. Telling can't be avoided... so just edit the hell out of such passages. I turn narration upside down and backwards until it fits and elevates. Still, even then, I am always leery of too much. Story telling is an art, different for each of us, but the goal is to hold the reader, and all we can do is try.