If you're looking for a good Bigfoot movie this is the only one that comes to mind.
Now, I call it good, not great. It has it's fair share of flaws, but being from the same guy who directed God Bless America and World's Greatest Dad I expected a certain level of quality often not shown to horror movies, and almost never to the found footage genre.
This movie handles it's scares with tact and maturity, and even has a very tense scene in a tent. I won't delve into detail as I do think this movie is worth watching. It's certainly nothing new, but it takes the good well established staples of horror, arranges them in a pleasant package, and doesn't have anything that really made it a bad movie...
...until the end. Sadly, without revealing too much, the movie has a rather disappointing, confusing, and unsatisfying ending. It doesn't ruin the movie as a whole, but since it's the last thing you see, a bad ending skews the rest of it in a negative light.
This movie was made solidly enough to the point where I can definitely recommend it. Willow Creek isn't the best movie in world, or even the best horror movie, but with all the recent schlock like Devil's Due and Paranormal Activity 5 it stands leagues ahead. I want a sequel to this, one that hopefully solves the problems this one had.
TLDR Version: Good, not great. Worth a watch despite it's flaws.