Been playing the new Doom on ultra-violence difficulty (just like the old games)...this thing is a blast. It's suprisingly tough (and often frustrating), but it just adds to the fun. I'm liking the various ways you can strategize against each enemy wave. I've been spending at least a few hours on each level making sure I get all challenges, secrets, etc., and it's been awesome so far. Two days of gameplay and I'm only now starting mission 5! This feels true to the first two games, and yet, its own thing all at once.