I don't know why anyone would be interested in visiting Deadwood, unless it's for the seemingly endless casinos. Between the the information center-suggested trolley-ride, which coincidentally stopped at none of the places you'd visit Deadwood for other than crummy hotels, and the dregs on the street trying to find another quarter for a slot machine, I found almost nothing to recommend Deadwood. And I wouldn't really call it child-friendly either.
Sure, there were a few "historic site" signs posted around town, and a small Wild Bill bust, and the cruddy shootout "reenactment" that is probably 10 times the decibel level it should be, and a few other minor "highlights", but I frankly wish I hadn't taken the time to drive to Deadwood. This place is tourism done completely wrong. Maybe I shouldn't have skipped the cemetery, maybe that's what it's all about, but I honestly could not leave town fast enough, so we decided to skip it.
I'll give it 2/5 because it didn't cause physical discomfort (other than the trolley ride which clearly had no shocks and tires made of cement (maybe).