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Almost all critics are trying to bury this movie because it is right-wing and Christian (all the other left-wing anti-Christian movies were never a problem though).
The movie is a cheap production, all the major plot revolves around two guys chatting in a room, but the dialog is really well written and both actors are doing a great performance.
It is also very different from modern horror movies, it does not contain jumpscares and shaky cameras. It would probably be better classified as a psychological thriller.
Even if you are not religious but have some interest in Christian lore you will probably enjoy it.
I typically like action and cult-classic films like HusbandsLead pointed out.
Apart from Boondock Saints, I absolutely adored Sinners & Saints with Johnny Strong and Sean Patrick Flanery. It's like a low-budget version of Lethal Weapon, but the lead isn't some broken down lunatic, but an absolutely badass lethal weapon. Bas Rutten, Kim Koates, and Coastas Mandylor are also in it.
Suicide Kings is another film that's very interesting. Takes a lot of twists and turns, and I thought it was pretty neat. Has an all-star cast of a lot of familiar faces when they were young, including Christopher Walken, Dennis Leary, Jeremy Sisto, and Jay Mohr.
He had a small role in Stallone's Eye See You, which was okay, but he was also in the short lived UPN show The Strip, which was like a newer version of Miami Vice set in Las Vegas.
He's been in a ton of stuff, a lot of it is not great, but for the good stuff he's been in (like the Boondock Saints/Sinners & Saints), it definitely stands out.