I enjoyed reading Goodnight PunPun. This is because the characters are unique and believable. Each character is striking and a lot of the time slightly unusual in some way. Each character that has some relevance has an interesting way of unfolding and showing more of themselves as time goes on. This especially shows with the character you are with the most PunPun. You get to see a kid with no defining identity break because of that; which causes him to do more rash thing because he finds that he doesn't matter. The only problem I can think of is the manga is very adult with many depictions of nudity, violence, and more. However if you don't have a problem with this I believe you should be able to enjoy the beautifully drawn manga.