The current way of crater generation makes it nearly impossible to give craters an ray system around their rim, which limits them to just being holes in the ground.
In real life this isn't the case, and using LROC Quickmap then zooming into any part of the moon will reveal a large amount of variety between craters. While most of this variety can be replicated in SR2 by using an noise input to the craters, they still lack their most defining feature, their rays or ejecta blankets.
To show you just how important these crater ray systems are to making the Lunar surface what it is, I have a couple of photographs of both the maria and mountains at an sun-up angle, and while you look at them I'd like you to imagine how it would look without those rays:
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