I don't understand the hatred. Big name game debut involves image of historical whaling. PETA try to use this example of whaling in popular culture as a talking point, and an attempt to raise awareness.
Crass? Yes.
Publicity stunt? Of course.
Poor target audience? Most certainly.
Crazy? No.
PETA have taken great leaps and bounds forwards in their PR tactics over the last few years and deserve to be reassessed on recent actions aside from their downright offensive past. When it comes to this campaign in particular, the most you can really criticise them for is the sheer futility of it. I mean, thanks to the Japanese Ministry of Fisheries, Australian Greens, the Sea Shepherd, and handballed publicity via The Cove and its awards, whaling is already a disproportionately visible item in the media. I can't see how they think this could possibly raise more attention. Plus, by drawing attention to a work that appears to depict whaling in a historical context, they actually lend credibility to the traditional whaling proviso argument.
PETA's efforts would be far better spent elsewhere, but that doesn't make them nuts.
Edit: It seems likely this was a response to very specific baiting from a "journalist" rather than a calculated press release. My points above still stand. Try to judge PETA on the merits of each campaign, not on their past ones. Their more recent campaigns have been fantastic in my mind. Remember that intentionally being divisive is a powerful marketing tool. Not the most ethical one in my mind, but still valid.