Not sure about the older reviews....this business has picked up a lot since 2012. I was here a few times this past November and December and it was really dead then. No cover, talented bands, but far from blues...and a huge variety of beers on tap (e.g. Bell's Oberon from near my hometown). Typically a nice mix of people here. Copper Blues reminds me of Martini Ranch minus the thugs and UFC wannabe types in the Shaker Room. (remember when that place was cool?)
I was here last night (Thursday) around 11.30 and saw a decent crowd, but it certainly was not packed. I noticed it picks up some patrons leaving the comedy club when that lets out. This bar/club is probably not for everyone but might be worth checking out if you're in the area or plan to come downtown for a weekend.