If you're looking for a typical Schwarzenegger action flick, this one isn't for you. Arnold Schwarzenegger thankfully seems to recognize that he's gotten a bit old to do the kinds of films that built his brand, and this film is much more of a drama than anything else.
Most zombie movies rely on the premise that the infected turn almost immediately. In "Maggie", however, the film is built on the premise that the infection takes some time to happen -- that the infected can function normally at first, but then the signs progress that the change from human to zombie is imminent.
Schwarzenegger plays Maggie's (Abigail Breslin) father. Maggie has been bitten, but has not yet turned; her father is in a bit of denial about her eventually becoming a zombie, and wants to make life as normal as possible for them in his daughter's end days. Deep down, he knows that eventually there will come a time where the worst of decisions will have to be made -- turn her in for "quarantine", or commit the deed himself -- but in between, both Maggie and her family know the world has changed, and must come to grips with what will happen.
Although this movie is tagged for 'horror', I don't feel like there was ever much "horror", aside from a flashback or two. This film is much more strongly weighted as a drama, where the disease in question is zombie-dom versus say, cancer or other life-threatening condition where the victim's final days are too horrible to face.
It's nice to have Schwarzenegger be able to prove he has some acting ability besides chasing down the bad guys. Breslin is talented, and in contrast to her role in "Zombieland", where she's more hard-edged, here she plays the transition of a girl frightened of her own pending mortality and potential future as a monster to good effect.
The film is slow in some spots, but again, this is a drama, NOT action or dark comedy or horror. Surprisingly likable film; not what I expected it to be.