Much of Boogeyman feels like a parody film, which is what I feel about a lot of 2000s horror. The feeling of trying to capture the great horror moments of the 80s and 90s are there, but they end up failing miserably.
Boogeyman is mostly just really boring. The characters aren't interesting, and some are actively annoying and uninteresting. You don't care if these people die, or disappear. Also until the very end of the film a lot of the disappearances happen off screen.
But the real kicker of the film is the horrendous CGI they use for the Boogeyman at the end. He looks so laughably bad the entire final fight I couldn't stop laughing. It was probably the only part of the film I enjoyed. Which, with a name like Boogeyman, left me completely shocked.