It gets some credit for attempting big budget SF ideas on a shoestring budget with passable results. The tree theme is unusual and there are inspired moments such as when Tolbiac's animal urges overwhelm the Botanist -- it's constructed with an unsettling ambiguity that put me on edge. But there's a problem when the elaborate constructs of the SF world are cliched, irrelevant detours from the central punchline. Meh.
Even though I didn't particularly like the shaky-camera-thingy (which is apparently very popular these days) at the very beginning or couple of moments, when the mid-production level became very obvious, I absolutely LOVED the claustrophobic, post-cataclysmic atmosphere, the social implications and the übermensch character. Btw, Pandorum is the total rip-off :P