Outbreak:Undead(O:U) is purely wonderful. As a game system, it isn't just for short games, also you can play a whole zombie outbreak, sure if you can survive. You never get so powerful that you don't fear zombies, but you get powerful enough to survive and have small breaks to breathe.
Solutions for most ambiguous positions like car driving, fuel consumption and stronghold resources, are well designed ad-hoc solutions. They simulate encounters very realistic, and are fast-play, learn-easy formulations.
Zombies, on the other hand, uses different rules than players. Many types of zombies are possible and they cover all-types of zombies. Templates for most common types of zombies are designed and presented in rulebook. Familiar Face and Janitor are good reminders that zombies are not about only bodies, but they are remainders of what they were before.
Character creation is easy and most common type survivors has templates designed. If you wanna play yourself that is not so hard. There is just one problem with character creation, it takes time. But character sheet is not big at all, just front page of an A4 type sheet.
GMing this game is mostly being a ruler. But that doesn't mean there is no fun. Fun of this game for GM is designing areas, planning zombie encounters and watch players shrive to survive. It is really fun, take this word to heart.
[5 of 5 Stars!]