眾所皆知本片因為最後一段整個重拍、所以成本往上加，
從去年底的檔期延到今年夏天，
導致負面傳聞不斷，甚至票房評價被看衰，被認為會慘賠。
很多影評都在討論最後一段，由結果論來說，現在普遍被認為成功。
給很高評價(A-)的娛樂週刊有特別專文報導這部片經歷許多編劇的過程、
以及評論最後一段。
由於他們肯定這部片，所以最後一段當然是認可。
理由是如果最後一段是原先拍的到俄羅斯展開大屠殺，
第三段就跟第二段以色列很像，
而且這部片的結構就會顯得很制式化：事情開始、小炸、大轟炸
大家都感覺的出來成品最後一段到威爾斯去，跟前面是截然不同的調性跟氛圍
因此讓這部片的節奏有些變化。
特別是最後只是一小群人為了怎樣躲過殭屍來生存，這樣的設計讓這部片多了點人味。
最後變成經典驚悚片的橋段也讓人滿意。
而且最後雖然改成找到方式對抗殭屍(原著跟原本拍攝的版本都沒有)，
但最終主角還是說一切尚未結束。
讓這部片到底有沒有機會拍續集都說的過去。 XD
當然這是讚美本片的意見，也是有批評的大家可以去看看。
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.