Riverplay

Ittenbach is actually the most known of the few german splatter directors. I liked this movie very much. It is not as campy as his earlier ones, and is based on a really good storyline. Though, as mentioned in the other comment, Ittenbach lacked to have really good actors and technique for it - otherwise it would be surely a genre-classic.

The story: six people gather accidentally on a hut deep in the woods. Nob and his wife Susan are not on good terms and it is likely that they will soon divorce. A canoe trip shall save her . On the river they meet soon Daniel und Walter, two friend, who have been to jail together. In the woods they meet Phil and Linda. They are an evil couple, who kill wanderers and eat them.

Soon a corpse of one of their victims is found. None of the three couples knows whom to trust, and Phil and Linda slowly try to reach their goal - to kill the four other ones... Compared to other Ittenbach movies, this one is not very gory, just in the final, which is in some ways great. I like the "serious" Ittenbach more than the "campy". If he goes on like this - which is not very probable, though - he could be a big name in the horror business, as Jörg Buttgereit already is.