When I say worst, it's not always just directing, production, storyline and acting. It's also often times that kind of "worst" that is so bad, it's almost good. If you are really into BF-themed movies, then all of these are worth watching, even the bad because they make you wince and then laugh. If you're into MST3000'ing movies, these are worthy ones to play with -
Assault of the Sasquatch: Here's the description (says it all) - When a merciless bear poacher is caught and arrested deep in the woods of a state park, he and his truck are taken to a neglected precinct in the heart of a dying city. Unbeknownst to the authorities, the impounded truck holds a deadly cargo in the form of the legendary Sasquatch. Now, stuck in an unfamiliar world, the creature will let nothing and no one stop it from coming face-to-face with the unscrupulous man who ruthlessly ripped it from its environment. Taking an inventive and action packed approach, "Sasquatch Assault" breaths new and exciting life into the immortal legend of Bigfoot.
Bigfoot (Syfy): Danny Bonaduce and Barry Williams with a godawful 30-foot tall CGI ape. Syfy all-star original movie - Need I say more?
Legend of Boggy Creek: I debated putting this in the worst column. It is a cult classic, but it's so tediously folksy and boring that it is rather campy and outdated. That being said, it scared the crap out of me as a kid in the theater. I had never heard of Bigfoot until I saw this movie. I later heard about something called the Patterson-Gimlin film that had been out many years earlier, but back in the "olden days," there was no internet or other means to re-watch it unless they decided to play it on TV again which they didn't. I did see it replayed in some Bigfoot documentaries that came out in the 70s after Boggy Creek. It opened a whole new world of wonder for me. They have the full-length for free on YouTube.
Yeti: Curse of the Snow Demon: There was a plot? Hmm... well, they describe it as; Surviving the crash was only the beginning. (kind of how I felt watching it).
Little Bigfoot: The Shoemaker kids are enjoying a quiet summer vacation in the country until they discover a friendly Little Bigfoot. Just as a point of reference for how bad - let's just look at the movie's cover -
Letters From The Big Man: You can purchase it here. This is my favorite BF movie of all time. If you're a nature-lover, have a lot of wonder about the universe, and believe there is more than enough room on the planet for us to live with mysterious beings, then you will enjoy it. The soundtrack is wonderful, the female lead is played brilliantly, and the beauty and wonder of the subject matter come across.
Creature From Black Lake: This 1970s gem is corny and campy at times, but when it gets creepy, it gets really creepy. Two college boys head south in search of the Fouke Monster. They soon realize that they are in over their heads and ill-equipped to deal. You can find this movie on YouTube for free.
Snowbeast: This 1970s movie is a bit slow at times, but it scared the holy crap out of me as a kid and still is a nice tense storytelling with an all-star cast. A ski resort is being stalked by a white Bigfoot who is not of the cuddly variety. Don't be distracted by the John Schneider modern version of this - get the original. HUGE difference. You can find it free on YouTube.
Boggy Creek 2: The Legend Continues: This one is campy horrible, but actually creepy. MST3000 made a fantastic episode of it. Don't buy it - just watch it for free on YouTube. It is a classic in campiness and scary things in the dark themes.
Abominable: What the hell am I doing putting a Syfy BF movie here? Well, Abominable was actually an interesting plot and creepy, although utterly ridiculously inaccurate like most movies about BF. The only "real" BF scenario I've seen is Letters From the Big Man, but if you like to be creeped out, this one of the newer movies is fairly unsettling.
Harry and the Hendersons: This beautiful family classic is actually the most classic BF movie there is. There is not one person who doesn't point to moments in the movie, like Harry eating the corsage or burying the animal trophies in the yard.