Hmm...if it did come out, I would think that the game would do okay. The gameplay seems simple enough for anyone to get, and subbed games can be possible here; there was Endless Frontier....The problem is that yes, there would be some sort of misunderstanding about the game itself (moral guardians would love to pick on it).
As for what game: I don't think the 360 versions would be well received here, with the games that the 360 usually gets, but that's my opinion. The PSP versions could work, but there's the rampant piracy. The DS one seems to be the best chance: a greater amount of people have a DS than a PSP in the US, so there could be more buyers.