Well actually number one was a lot like the first game..
number two was a lot like the 2nd game.
"a lot like" in general idea.
I mean, you can't be running around on your own in a movie for that long, it would be boring.
I think the movies have been great, paying respect to the video game idea of which they came from, while developing themselves in their own right as movies. I personally prefer the first movie to the second. The first movie was horror, the second was action with zombies.