Too much rock'n
I stayed at the Hard Rock during a recent convention in Chicago. The hotel was conveniently located in downtown and we were able to walk to Rush street and other local attractions. The hotel itself was just OK from an accomidation standpoint. I, and the people i was traveling with, did't like the decor in the rooms. Who wants pictures of rock stars in their bathroom?? Also the constant music made it feel like we were in Vegas rather than in Chicago. 
The doors didn't seal too well so I heard all the noise in the hallway at 3 AM! Didn't sleep well at all. Not a place i would stay again if there were other options.