Leon's campaign looks like Resident Evil but...
There are some moments of greatness sprinkled here and there. The prologue is a genuinely thrilling experience. The updated MT Framework engine is doing some incredible stuff here, especially in terms of lighting. And, the game is going to be a very lengthy affair--I'm guessing well over 24 hours to play through all four campaigns at least once. And that's not even touching any extras, like The Mercenaries.
But while there may be a lot of game, the question is: is it worth playing? I've only played the first 10 hours of the game, but I can honestly say I'm not looking forward to seeing any more.
Not a screenshot from Call of Duty