Sorry, but only 4,7 for this little gem, is kind of outrageous.
Yes, a lot of flaws, however, the build up is quite good, the writers don't waste a minute of the film, characters are introduced, and they make the city, a character, which is kind of refreshing, given as Jerusalem is a film that is basically absent - in its modern incarnation - of cinema... and despite World War Z taking place for 20 minutes there, in this film, the city is fleshed out as a character, finding the right balance between faithfully portraying the critical real situation but not making it distract the audiences from the real point of the story, the Apocalypse itself. Given its limited budget, the results are quite good, the sense of dread increases throughout the film, correctly, and while the ending is a bit obvious for those who paid attention, it's a fulfilling one. I'd give it a 7.