While "Pentagram" offers an intriguing premise of teenagers trapped within a mysterious pentagram, the film falls short in its character development. A more nuanced portrayal of the characters would have significantly elevated the narrative. The lack of palpable tension between the main protagonists detracts from the suspense that such a plot demands.

Moreover, the subplot involving the group robbing a diner at gunpoint feels implausible, given the character dynamics presented. Predictability is another issue; the climax, rather than being a shocking revelation, is something one could see coming from the early stages of the film. In essence, "Pentagram" had the potential to be a gripping thriller, but it misses the mark due to its underdeveloped characters and foreseeable plot twists.