Alright, the opening scenes were actually pretty great. The one problem was that a small child attracted all the zombies and ended up leading to the deaths of 5+ people. The Father gets away in the boat after tragically losing his wife and having to leave behind everything stable and secure about his life. Strike one against children: because of an idiotic five year old that just happened to make Darwin turn in his grave, several people died. And the rest of the movie wouldn't have happened without him if you think deeply.
The Father then meets his children in the Isle of Dogs (I think, I am a dumb American so I am not sure) and everything is good. They are perfectly happy and safe, with no zombies around to hurt them. Then the two kids turn out to be just as stupid as the first, as they sneak past the military and go into the zombie infested areas. Strike two against children in general: don't fucking leave the safe zone. They find their mother, who avoided both getting torn apart by zombies and being infected because of something with her eyes This is fine until a bit later in the movie.
When they get back, they act like a couple of little pricks and basically disowning their father for lying about their mother. Alright strike three: Their father was the best character in the movie (this is debatable when the sniper comes into play) since he actually shows something deeper than the typical shitty horror motivation. Do you go up against unbeatable odds to save your wife or do you escape to care for your children?
Anyway, the father tries to make up with his wife and desperately pull his family back together. He then becomes a zombie because the virus is still alive (I can still suspend my disbelief until just a bit later) and then the tragic hero gets blood sacrificed to being the main villian, dying with the last words from his mentally challenged children being basically "I hate you".
Meanwhile, a military scientist finds out about the eye thing that prevents infection, and decides that the children are the key to curing the outbreak. Okay first, it is a genetic physical disorder, their isn't any chemical to recreate in their blood, it is a hereditary issue with their eyes. And second, why the fuck would they need this if it weren't for the children rereleasing the virus in the first place?
So then the safe zone gets overrun, with nearly all of the inhabitants getting killed. The kids get away after heroically shooting their father to death and leaving behind multiple other survivors. The zombies reach Paris thanks to the kids*, and the theater going public goes wild.
By the way (another dumb american question) were the zombies supposed to have gotten to Paris through the Chunnel, or just appeared there randomly?*