I love Diablo, it's by far my favorite game out there. You get to pick a cool character, get awesome items, and fight the hordes of hell (who are often female and mostly naked), really what could be better? 
I've never played Fallout, so I can't really compare the two.
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"The world is so exquisite with so much love and moral depth, that there is no reason to deceive ourselves with pretty stories for which there’s little good evidence. Far better it seems to me, in our vulnerability, is to look death in the eye and to be grateful every day for the brief but magnificent opportunity that life provides"
-Carl Sagan
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