Better than the first one. Better graphics, better zombie movement and better AI in general. I played the campaign and I can say it's way better than the first iteration. It's more fun and harder to get to the safe houses than before. You have many types of guns you can use along the five or six campaigns and your teammates can help you if you're in trouble. The same with your teammates. You can help them when you're in trouble. The reproach I have for this game is the lack of a story. I would have loved a story, something to make me sympathise with my mates. It's a game filled with action and at times you can easily die if you go straightforward or headlong. You have to wait for your teammates and co-operate with them. Overall, it's a great game.
I know gamers love it for its multi-player but I don't play games for multi-player, but for the story.