At first I disliked it , coming off just playing the first one. Things happen in the beginning which is very controversial. I stuck it out and I must say it was actually a good game. It has some slight improvements from the first one and some decent action in this one more than the last. I started to enjoy the story a bit later on in the game, first one is way better.
Just stick out the beginning and you will be alright. After the beginning the action gets good, some really good levels. I enjoyed fighting both humans and zombies at the same time, makes for some great strategy.
There was a bombs level which you had to avoid loads of landmines which was pretty cool and a shootout in a car.
It's not a masterpiece but it's a pretty good game, definitely worth the play.