I bought it, and thought it was worth it in the end.
I wouldn't buy it just for the gore; the graphics on the Wii aren't the greatest for that. If you're buying it for the atmosphere/story/gore all in one, then I think you would like it. I actually almost got through the game a second time, but I ended up buying other games, so it got shelved. I do plan on going back to play it through the higher difficulty level at some point though... which is something I can't personally say about MP3.