In Russia there is joke 'every taxi/bus driver listens "criminal songs (блатные песни)"'. It is based on reality though. Usually this kind of songs has simple and soft rhythm which makes it possible to listen them infinite time. Like 'ambient' music. But also they have some 'hard' text inside. Something about son in prison remembering mother, betrayal of best friend of thief, offensive cops, tattoo of christian church on the chest and so on.
'Gangsta rap' concept is near and far at the same time. To say the truth this one song of Krug is one of the best and well-known songs of this genre. You may end up with liking it one day. Most of others are worse. Typical man in Russia really do think about this genre as 'bad taste'.