It would appear that as of lately, cheating has become a serious problem, and many players are of the opinion that the developers are not doing nearly enough to combat the problem (even suggesting that the developers are open to players modifying shaders and such, which can obviously be used to gain a significant advantage). I can't speak from personal experience, but I do know that seeing many of the reviews marked as "most helpful" complaining of cheating and/or pro-level cs-go players dominating the game definitely discourages someone from buying the game who just wants to have some fun. Sure, all reviews can't be believed, and some could just be players getting their butts handed to them who are bitter, but when the developers ban people outright from their forums for even talking about cheating problems, its not doing themselves any favors.