Delgo
Up until "The Oogieloves in the Big Balloon Adventure," this was the worst opening film (and one of the biggest flops) of all time, opening at $511,920 in over 2000 theaters. The makers wanted to be a pioneer in independent animation. It was made in 2000 but couldn't get released until 2008. As a computer animated film it is awful. The voice actors are random (Freddie Prinze Jr., Louis Gossett Jr, Sally Kellerman, etc), and the plot is complicated to the point of incomprehension. It's a real treat.
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Landon Kemp commented
Known for its long production period as well as being one of the lowest grossing movies ever, with a cliched plot, ugly-as-sin characters and animation, and a comic relief voiced by Chris Kattan that is considered worse than Jar Jar Binks.