Season 3 of Robot Chicken has everything going for it that the first two seasons did. Thus, if you already like this show, then know that this season is more of the same quality, and just stop reading now. You already know enough to decide if you want this DVD.
If you're new to Robot Chicken, have no fear. This is just as good of a starting point as the other seasons, because there is absolutely no connection between any of the skits and others in the previous seasons. The short skits (which can go as long as three-four minutes or be as short as a couple of seconds) are merely humorous bits that mock pretty much whatever comes to the minds of the writers. This show is one of the funniest things I have ever seen. It is at times very clever, though it is far from above toilet humor, heavily suggestive bits, and bad language. It's sometimes extremely childish, but seeing as this whole show is done in stop-motion animation using things such as barbie dolls and claymation, it's hard to really blame it for "childishness".
I really recommend this show, and this season. If this is your type of humor, season 3 is definitely for you.