As a native of Atlanta and a local I have to say that Underground is a good place to visit. The crime that some have associated with Underground and the area are not so. I have lived in Downtown Atlanta and work across the street from Underground at Georgia State University for over 25 years. You do NOT need to walk in fear around underground. That does not mean that you should not exercise caution, especially at night. Unfortunately the World of Coke has moved to Centennial Park next to the Georgia Aquarium so that major tourist draw is gone. Still its worth a check out.
Pros: fun atmosphere, lots of interesting shops.
Cons: World of Coke have moved
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