Oddly enough, I was playing LFD yesterday afternoon, I got the game for Christmas.
I'm about halfway through the single player game, I haven't tried multiplayer yet.
It's good fun, if a little one dimensional. The game consists of: You shoot zombies. That's it
It's certainly worth £13.49 but I honestly don't think it was worth the £30.00 charged for it by most places when it was released.
But, as I said, good fun, an excellent way to waste away a few hours
I like to use the sniper rifle at the start of each level and pick loads off, then nip back into the safe room for a different weapon.
And a head shot with the sniper rifle blows the zombie's head right off with a big red splat