Village Voice review
Village Voice spoke about Christmas on Mars: http://www.villagevoice.com/2008-09-10/film/christmas-on-mars
Sounded like they didn't like it.
Besides the above, I've only heard reviews from mega-fans and I can't take thier opinion to heart.
I guess, in thinking of it as a homemade project, it should be evaluated using a different scale, but its not like The Flaming Lips, Brad Beesley, and others who worked on the project aren't professional artists with a lot of talent.
I, personally, think they should have made it a musical and gotten some financial backing to make it worthy of theatrical release. The Lips are well loved in Hollywood, it could've happened.