A movie written in dive bars and coffee shops, rewritten countless times, and done on a shoestring budget to get another movie out of another movie's props, with two days of indoor shooting.
If you expected solid cinematography, good plotting and pacing and a nice neat bow of an ending, your expectations may need moderation.
Also, it's #monsterdon, we're not lining up Masterpieces Of Cinema here.
Thanks @Taweret for this cornerstone of film.