As an original, non-bandwagon Arrested Development fan (watched it on TV since the first season), I'm not sure how well it would work as a movie. I'll still watch it though.
Also, vudu's partly right, but both the first and the second seasons are amazing. The show started to lag a bit in the third season, especially with that whole Charlize Theron arc, but it finished incredibly.
And yes, the Martin Short episode is garbage. Probably the only one deserving of being called that.