Tremors - still holds up. Inventive and silly.
Tremors 2: Aftershocks - A giant step down from the first, but still watchable. Fred Ward (Earl) returns with a new sidekick, and Michael Gross returns as well (Burt the gun nut from the first movie)
Tremors 3: Back to Perfection - Wow these got bad. Michael Gross is back again and is the main star, along with a few small parts from people that were in the first movie. The creatures get more ridiculous, and the effects work is at its worst.
Tremors 4: The Legend Begins - This one goes back to 1889 where Michael Gross plays his own ancestor and helps defeat the graboids. The whole beginning and middle of the movie was really boring, but it sort of picks up at the end. The gunslinger character was particularly bad.
Tremors 5: Bloodlines - This one was actually a step of from the previous few. Michael Gross is again hunting the graboids, this time in South Africa. The effects work are actually not bad in this one, but the existence of Jamie Kennedy sort of dragged the whole thing down for me.
Creep - Found footage movie about a guy who hires an amature cameraman to film a diary type video for him. It was pretty average, nothing really special about it, but wasn't terrible either.
The Human Centipede 3: The Final Sequence - First I just want to say that I thought the first two movies in this series were alright. They weren't amazing, but they weren't as appalling to me as they seem to be for most people. This one, however, was so bad in so many ways. A Texas prison warden can't keep his inmates in line and nothing works. So he decides to turn them all into the first human prison centipede. It stars the doctor from the first movie, and the killer from the second movie, as the warden and his assistant. The warden's secretary is portrayed by pornstar Bree Olson, and he abuses her physically and sexually throughout the movie. Some of the low points, for those who don't care about spoilers:
The warden castrates an inmate with a pocket knife (you see it all), and has the cook prepare them so he can eat them. The warden has a jar of human clitorises he imported from Africa and snacks on. At one point he has a dream of a prisoner shanking him in the side, then raping the hole. He forces his secretary to give him oral sex in his office, in front of his assistant. He rapes his secretary after she's been beaten into a coma ("the sight of a beaten woman makes me so hard", he says), and then he sticks her into the human centipede just for the hell of it.
Somehow the first 2 movies didn't bother me, but this one just comes across as a pathetic attempt to top them.