I thought this movie was a cute summer flick. The story line was straightforward and pretty predictable, but R was relatable and you rooted for him. I didn't really like Julie's character, though. The movie was very obviously marketed to teens; R's inner dialogue speaks of angst and questioning purpose, individuality, feeling lost, etc. and he had complete hipster music tastes- I mean, he had a record player in his airplane compartment.
I enjoyed the movie ( I was half-passed out with heat exhaustion while watching it, so maybe I was less inclined to be critical) but there were some things that I thought could have been better. The main weakness, I felt, was that the movie had a lot of great ideas that the writers never really followed through on. In the beginning, the film is presented as a sort of mild parody of a zombie story- the lines sort of make fun of what's happening, and it has a little bit of a sarcastic edge that forces you to crack a smile. But I think the story got too involved as it went along, and lost a lot of the comedy. To be a parody, the narrative has to have a certain distance and sense of humor from the events in the story, which this lacked.
I was actually very interested in the way the whole zombiepocalypse was presented as a criticism about today's teens. (i.e. the main character and many of the zombies lived in an airport-- they were set up and in the position to go places and yet lacked the drive to. The zombies shuffle around with no purpose and lack communication skills. R is trying to define himself and remember who he is, but he can't quite.) R's journey is definitely one of self-discovery, but the commentary on teens began to fade as you got deeper into the story line, and towards the end it was really a stretch to relate what was happening to the original ideas.
It was only towards the end of the movie that I realized the love story of R and Julie was a nod to Romeo and Juliet ( I had this little epiphany only when I saw Julie perched on a balcony speaking down to R and I sarcastically remarked "Who are you, Juliet?" after which I quietly went "Oh." and then curled up in embarrassment.) I could understand this to an extent-- the zombies as the Montagues and the humans as the Capulets, Julie's overbearing father, etc. But I got a little too excited and jumped straight to thinking the whole story had understatedly been mimicking the events of Romeo and Juliet, which it didn't. I think that little detail was thrown in there simply for the cute factor, but I wished they had followed through with it more.
Overall, it was a light viewing and not memorable but didn't offend me in any way and was enjoyable to watch :)