Okay, not as horrible as you think if you can handle original 1960s sci fi like outer limits, which live on story development rather than eye candy. I "watched" this as background audio and eventually became engaged enough to pay some attention. One watch through left me some questions, so I am not really sure if it deserves a 3 or a 6. So I'm giving it a 5 because you know some of us need to support the mere fact of an unusual and unpredictable story in a mainstream DVD release.
Just watch if you are intrigued by time travel story lines and theories.
Acting across the board felt passable, but the patience of the producers deserves credit. Not an easy undertaking with so much happening with visuals relying on a paper thin budget. I'm sure direction and a few actor choices could have improved the film. Music wasn't terrible. Worst choice in the movie for me is the way the radio communication between various space personnel is over-done, making it indecipherable on my low grade DVD box.
If you just must consume time travel flicks until you burst, you may explode on this one, or on Lunopolis.