Review for Diamond Jo Casino Dubuque Review For Diamond Jo Casino Dubuque Google User Oct 22 '17 at 2:20 The band was very good. The main bar was very busy, with very long waits. Went to a side bar with little to no wait & was stopped by a very rude staff on a "Power Trip". She would not let us get a beverage from the bar. Bad customer service & loss of revenue. As we walked away, 2 other people shared with us their bad customer service experience from same staff. Not sure if company has contunious customer service training or not, but it would be beneficial!!! View full site to comment or like