Garden State must rate amongst the most contrived and pretentious films of all time. The plot is a simple one, involving a young man returning home after his mother's death and discovering love. But really, the plot isn't important. What is important to Zach Braff - writer, director, and star is that he is able to hang from the plot all the necessary accoutrements of an 'indie' or 'arty' film. We therefore are presented with endless cute and quirky characters and scenes that don't exist for reasons of plot or character development, but simply to give some artistic credibility to the film (à la Wes Anderson - or so Braff hopes). Unfortunately and somewhat astonishingly, Braff has not only fooled many on IMDb, but also some critics who really ought to have known better.
Of course, Braff's gratuitous use of the quirky alone does not make Garden State a bad film. What really makes Garden State a stinker is Braff's script. He simply does not have the writing skills to carry this film off, and the dialogue and characterisation are abysmal. Braff often has to resort to blunt devises and symbolism to achieve what he can't achieve through the writing. For example, the numbness of the Braff character is shown to us by his indifference to an impending plane crash (this can't be worked into the plot, and so has to take place in a dream!), later he is shown fighting back against his circumstances by screaming into a bottomless abyss (life = a bottomless abyss, very clever Mr Braff). Those two scenes must rank amongst the most ludicrous and contrived ever seen on a cinema screen.
On the plus side, the acting is passable despite the lack of material for the cast to work with (by which I mean a script), and I do admire Natalie Portman for her efforts as the love interest - a character so badly written and implausible that she is little more than a mindless doll that Braff moulds into his fantasy woman.
It apparently took Braff 3 years to write the script for Garden State (3 years to write a script this bad - he really is inept!). Hopefully therefore it will be some time before he makes another film.