I like to take pictures myself, and I do edit them in Lightroom or Photoshop to improve the exposure, crop, straighten etc, and sometimes to clone out a piece of rubbish on the grass or something like that.
You don't always have the optimal weather or lighting when taking photos, so sometimes they need lightening and sometimes a bit of darkening if the camera has "blown out" the skies for instance. So sometimes the photo does not look like it actually did in real life, so I don't think it is bad to adjust an image for this.
But since I do graphic design as well, I sometimes get a bit picky about pictures, which is why I end up trying to take my own photos. I don't like the date appearing on photos (which others may have on their digital file), but on the other hand that can be very useful when it comes to family photos and records.