I've been reluctantly planning on watching this movie for years. Through many references, jokes and memes on the internet, I have always been aware of the concept of "human centipede", and was greatly repulsed, very apprehensive, but also a bit curious about this controversial movie. However, nothing about having your mouth sawn to somebody's anus and being forced to eat their shit really screamed "must watch" to me. But recently, I dared myself to watch a whole bunch of controversial and weird movies that I otherwise perhaps wouldn't be all that into, so I finally gave The Human Centipede a shot.
And to my astonishment, I really really liked it! The biggest part in it played the main villain, doctor Heiter, who was just amazing. There are many movies that are sorta ok, but you just can't get into them because there is no character in them that you really like, or find interesting enough to follow around. Not in this one! Doctor Heiter is a character I fell in love with immediately, he was just so delightfully creepy, weird, evil and completely batshit insane in a really entertaining way, almost like a comic book or an anime villain, it's hard to explain to people who haven't seen for themselves. This guy and his great yet bizzare acting really makes this film worth seeing in my opinion.
To dispel your worries I have to say, the movie wasn't nearly as explicit as the concept would suggest. You can never actually see the anus being sawn to mouth, you can't see much of the operation at all, and the finished centipede people are wearing sort of diapers that cover both the anus and the mouth, so you can't see anything. The shit eating actually only took place once on screen, again with nothing being really visible and the scene ending rather abruptly (which I've actually been very grateful for because I've been dreading it all along).
All in all, this reads more like a movie about an insane german psychopatic doctor who kidnapps three people and tortures them for no reason like a fucking maniac, than a movie about eating shit, which I was very pleasantly surprised to discover.
Long story short, I was throroughly entertained throughout the whole movie and was not bored for a moment. People who give this movie low reviews are simply taking it too seriously, and are not relishing the absurdity and ridiculousness of it all. Watch this movie as a dark absurd comedy and you are set to go!
Now I'm not really sure if I wanna give the sequels a watch, because without the dear doctor Heiter who unfortunately perished at the end of this movie, it just won't be the same, I'm afraid...