Do NOT, under any circumstances, get the idea in your head that these games are at all appropriate for children based on the graphics. I could imagine someone doing so, and want to warn against it right now. These games are strictly for teens and up, with profanity, adult humor (including sexual references), and mild violence. They are also quite amusing for what they are, so I definitely recommend them for the target audience.
The only downside is one that is shared by many such games, in that many of the puzzles make zero sense, requiring either a great deal of random guessing or the use of a guide to get through the games. Yet, at least in these games, the randomness fits. The entire storyline is so absurd to begin with that it's actually all to be expected in this case. Regardless, the real appeal here is the British humor, the adult level of the story, and the crazy storyline. It being a point and click game is really just a means to an end in order to convey all of that to the player. I've definitely been entertained, so it works well.