I think a simple statement reminding readers that this game is for mature players might be in order, in case you've been living under a rock and did not know that already. To use your example, I would not necessarily expect a review of the second season of Deadwood to remind me of the foul language - it's already pretty much out there as cultural knowledge.
I also think that within the context of a game review, a discussing its morality would not be out of place, but it's also not required. Again, partly because that has been discussed to death already, and partly because the purpose of a review IS to discuss whether it's fun to play, not whether a player should be doing so.
I also think that within the context of a game review, a discussing its morality would not be out of place, but it's also not required. Again, partly because that has been discussed to death already, and partly because the purpose of a review IS to discuss whether it's fun to play, not whether a player should be doing so.