This is my take on it exactly - i'm not offended... i watch Jimmy Carr and laugh at his most offensive jokes - but that's because i KNOW i'm going to see a comedian and context is key. They have literally made a game about one of the worst things to have happened in Russia, and have (whether on purpose or not) made light of it. You can't have a "light-hearted" look at genocide.
Anyway, it might also be worth looking at another one of their slots coming up - because if they think the backlash on Gulag is small, the lawsuit from Mattel absolutely won't be.
< check the comments for more previews of the BDSM stuff in the game
Don't get me wrong, they have really pushed the bounds on themes in games, and this is to their credit BUT how far is too far? For me, and many many others (and EVERYONE i've spoken to in the industry) they have gone far too far.
Gambling has a bad enough reputation to start with - they are fooling themselves if they think that they are not damaging it even more.