Apart from having funny and lovable characters, the main reason you should watch Superjail is the art. While the animation is not the best I've seen, the art is so creative and chockful of details that you'll constantly want to pause the episode to look at the gorgeous and bizarre drawings.
They even draw a new intro for every episode, it's insane!
4 stars is being generous to Superjail but it is great fun to watch. You couldn't sit down and watch 3 seasons in one sitting (or I couldn't anyway) but it is definitely worth having in the collection. Chris McCulloch (aka Jackson Publick of Venture Bros and The Tick fame) is involved in this show and that alone is worth watching it for. Crazy animated battles like something us boys would draw on graph paper in middle school. Lots of fun