It was always going to be tough to live up to Blue Harvest, the Family Guy spoof of Star Wars Episode IV, and unfortunately this spoof of The Empire Strikes Back didn't quite do it for me. I like Family Guy a lot and actually got into it after catching Blue Harvest whilst flicking channels on the tv, and the rest is history.
Dark Side follows on from Blue Harvest at a fast pace, starting on Hoth. I felt there were, as another reviewer states, a few too many cut-away scenes that seem to be a bit too in-jokey and will appeal to American audiences and not other viewers as they refer to obviously American things, like Juicy Fruit ads. I felt it also lacked a bit of the really sharp observations we saw in Blue Harvest, such as the Death Star guys complaining they don't have a rail etc.
Bits that are a success are of course the faithful story-telling of The Empire Strikes Back, which shows the Family Guy team are obviously huge huge Star Wars fans, as I am, and the animation (done by rendering) is a joy to watch. There are a few little observations which I did enjoy, the way characters say their lines which were memorable from the original ("Good. Our first catch of the day.") etc.
Overall, this is average at best, and I'm sad to say lost my interest halfway through. It is still worth watching though if you're a fan, and I will of course watch if there is a version of Return of the Jedi. If you liked Blue Harvest, and if you haven't already, watch the Robot Chicken version. The bit with Admiral Ackbar on the quiz show is hilarious.