It's almost worth watching the movie for Rob Riggle as Frank West.
Somewhat fun if you've played the games.
The movie would have been enjoyable as two 30 minute episodes. As a full length movie, you'll spend more time watching the clock than the screen.
Dennis Haysbert was a bizarre casting choice.
The movie could have really benefited from taking the style of Dead Rising 1 and Dead Rising 2. Instead it tried a more gritty Dead Rising 3, which is unfortunate, because it missed the only opportunity to be something other than low-level-zombie.
Take a combined 20 minutes of funny Rob Riggle and Dead Rising Easter eggs, wrap it in an hour of decently acted bullcrap, and you have this movie.