Opinions seem to vary greatly about this film. Some viewers seem to like it, find it real cute, compare it to Amelie, enjoy the shifts in style and tone. Others seem to loathe it, find it derivative, decry the exaggerated acting, disjointed style and too simple story, and feel they have wasted 90 minutes watching it. The opinions run all over the map, as the grades and critics reviews show. Some love it, many hate it.
I don't understand the latter group. This is exactly the kind of film I enjoy, in the same style as the movies of Richard Lester and Maurizio Nichetti (the early ones like Ratataplan). Start with a rather original story: a lonely post office employee who rewrites letters in her spare time. Amelie came out at the same time, and features a young girl who also tries to change others lives, but in many ways Nada is more fun and less smug. The disjointed style and abrupt shifts of tone kept me entertained. Here is a director who loves to play around. The slapstick scenes were exaggerated, as they should be, the romantic scenes funny and touching, and two sections showing how the letters affect their recipients were, in my opinion, successfully poetic.
Malberti shows promising talent with interesting predominately black and white camera work, which sometimes imitates the style of silent comedy, from Chaplin features to Keystone Cops. The quirky editing, overhead shots, fanciful touches, and series of funny supporting characters all contribute to the movie's charm. Thais Valdez is really charming, at the same time a fun cute tomboy and a mature weary lover. She is a real find.
If you like your films sober, intellectual and serious pass this one up. If you are ready for a wild mixture of bureaucratic satire, introspective social drama, slapstick comedy, cute love story, Havana travelogue and some poetic moments then jump along... It's a real fun ride!