众所皆知本片因为最后一段整个重拍、所以成本往上加，
从去年底的档期延到今年夏天，
导致负面传闻不断，甚至票房评价被看衰，被认为会惨赔。
很多影评都在讨论最后一段，由结果论来说，现在普遍被认为成功。
给很高评价(A-)的娱乐周刊有特别专文报导这部片经历许多编剧的过程、
以及评论最后一段。
由于他们肯定这部片，所以最后一段当然是认可。
理由是如果最后一段是原先拍的到俄罗斯展开大屠杀，
第三段就跟第二段以色列很像，
而且这部片的结构就会显得很制式化：事情开始、小炸、大轰炸
大家都感觉的出来成品最后一段到威尔斯去，跟前面是截然不同的调性跟氛围
因此让这部片的节奏有些变化。
特别是最后只是一小群人为了怎样躲过僵尸来生存，这样的设计让这部片多了点人味。
最后变成经典惊悚片的桥段也让人满意。
而且最后虽然改成找到方式对抗僵尸(原著跟原本拍摄的版本都没有)，
但最终主角还是说一切尚未结束。
让这部片到底有没有机会拍续集都说的过去。 XD
当然这是赞美本片的意见，也是有批评的大家可以去看看。
http://popwatch.ew.com/2013/06/22/world-war-z-ending-sequels/
The film begins with an epic scope, with gigantic action sequences that race
throughout major cities; but in the finished product, Pitt boards a plane to
Cardiff, and the final sequence feels more like a classic zombie horror
movie, with Pitt and an essentially all-new supporting cast walking quietly
through darkened corridors. (You see hundreds of people die in the first 3/4
of the movie; after the plane crash, the living/undead body count doesn’t
even come close to an episode of The Walking Dead.)
To me, though, the funny thing is that the radical change actually seems to
work. This might just be because World War Z is a film constructed out of
episodes, with roughly the same three-act set-up. Act One: Brad Pitt goes to
a city. Act Two: Zombies attack. Act Three: Brad Pitt runs from attacking
zombies. The original Russian-set final act sounds like an extension of the
Jerusalem scene, with hordes of digital zombies who all move like
wildebeests. But the Wales sequence raises the stakes by lowering them: Brad
Pitt and his friends need to get somewhere to get something; in order to do
that, they need to avoid the zombies. It’s the kind of simple plot that would
’ve made for a great episode of Lost, and it brings an element of humanity
to a movie that previously traded in gigantic disaster setpieces.