The question has always been "to crop or not to crop".
It's pretty simple...crop as much as you want as long as it does not degrade your image.
If you have a camera that is packed with megapixels, cropping shouldn't be a big problem. That's the advantage of having a camera with a big megapixel count. You can crop more to show a particular area more, without much degradation. Although make sure that your main subject is in focus when you crop, or you'll just end up showing a subject that is out of focus more.