@Thenomain Because it is very much a place where the majority are essentially slaves to the corporations they work for, or the SINless in the sprawls who have no identity at all and pretty much live in a third world economy where might makes right, gangs can and do rule huge swaths of area, supernatural rats are a serious threat, trying to survive every day is a very real struggle and life is by no means certain.
There's darkness and grittiness there, in addition to the Runners themselves essentially being 'outside' the system, yet without the 'system' they wouldn't have work either.
If you are rich/influential/powerful then the world of ShadowRun is luxurious. For most (PC's included) it's the opposite, it's a harsh struggle for survival. There are more 'Runners than work, and you might be flying high one month only to be back in the gutter the next.
Meanwhile the cops are corporations in their own rights, and don't really care about the rights of the individual over the 'Law' they have been hired to enforce (to varying degrees of accountability) mixed in with their own greed and needs.
That's the dichotomy I mentioned, there's the potential for the 'high fantasy' bit where magical people have incredible magical toys, the rich have the best pads and cyber/bioware, and then on the other side there is the guy who got rolled and his arm chopped off because it was a prosthetic and what's left of him gets sold as meat to Tanamous Ghouls.