They are actually pretty useful, if you use them for what they're intended.   A starting point, not an end product.  I use them to show me where little bits and bobs on a texture map should go, rather than pulling a texture map from a product I've purchased.  I do that for 2 reasons; 1. to learn, and 2. to keep me out of copyright trouble should the need arise to question where I got what.  I've had some photo resource packs that I've purchased that are missing one thing or another (some of them don't include elbows or have the nipple or genitals covered), I've used a resource kit to fill in the blanks.  That's just what I do, so, YMMV.

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Knowledge is knowing a tomato is a fruit. Wisdom is not putting it into a fruit salad.