The quality depends on the resampling algorithm used.
This applies especially while downsampling (making images smaller) in lower ratios (like to 70% of the original image size) and is not such a big problem while downsampling high-resolution images. Without that, the image would look sharper but ugly "stairs" would be visible on all edges that aren't either 100% horizontal or 100% vertical. The process includes anti-aliasing which is a sort of mathematical blurring of the picture to remove aliasing. If your workspace is say 1800x1000 pixels and the image is 2400x1600 pixels, the resampling algorithm has to create 5 pixels from the original 8 pixels to fit in screen. If you open images that are bigger than your screen (or Photoshop/image viewer workspace), the software has to resize (resample) them to fit in view.
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