I never had any problems in Bamako. Corrupt officials are just a fact of being based in most countries in Africa sadly.
Mali has undoubtedly been less safe since the 2012 coup and the Touareg rebellion, but no worse than many countries in the third world and considerably better than some. Terrorist groups like AQIM, Mujao and Ansar Dine will always target expensive locations with high concentrations of expats or UN workers like international hotels. I always try to 'fly below the radar' and go to local places of entertainment with local friends. Had a few muggings, but nothing too bad as long as you accept it as part of life in 'interesting places'. Have fun
