Horror movies I watched in the past year or so ( My opinions on their quality obviously, everyone here might feel differently of course)
Must See
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The Loved Ones - A horror tale about prom night and about how people cope/can't cope with loss. Best horror movie I've seen in the last five years. All the gore/violence actually serves to develop/highlight something going on with the characters involved, IMHO, a lot of the horror isn't what's shown but what's clearly implied about the people themselves. IMHO, if you don't see this movie, and you love horror, then you are missing out
My Super Psycho Sweet 16 Part 1 & 2 - IMHO, it only really works if you watch both together. About a girl with the legacy of a father for a murderer. Low budget but very honest and respectful to a lot of hard truth about teenagers, high school and the infinite capacity for cruelty in most. I believe these were originally aired on MTV. These are are very solid, though no groundbreaking, horror flicks.
The Horseman ( 2008) - This might fall a bit into the thriller/revenge category more than horror, but I think there are enough horror elements in it to qualify. Australian movie about a father dealing with the loss of his daughter. This is a really brutal and surprisingly honest film. This is like Man On Fire on steroids. Lots of steroids.
Dead Set - BBC short series ( The total is about the length of a 2 hour movie) about a reality show caught in the middle of a zombie apocalypse. I don't really watch reality TV, but I've been told if you do somewhat, there is a lot of dark humor as well. Low budget but pretty well made.
A Serbian Film - This is essentially a mock snuff film inside of a fictional snuff film. I would say the violence itself ranges borderline on torture porn, but there are high production values and it does cover the theme of why people watch what they watch and the nature of a viewing audience and the reality of it all. If you have a strong stomach and can get past the violence ( IMHO a lot more is implied rather than shown, but still a good amount is shown), there is a lot of strong subtext about human behavior and the nature of violence. IMHO, this is a movie you should watch alone first if you are a big fan of horror, if only because the subject matter is grim enough to where you might not want to expose casual horror fans to it unaware. I suspect this is a film that will be eventually banned in many countries at some point.
Pretty Good, Worth Renting
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Splinter
Frozen
Carriers
The Final
Buried
Kill Theory
Hunger ( I really liked this one)
Pontypool ( I think people will be split on this one, it's a love it or hate it kind of movie, I really liked it)
Guilty Pleasure ( Good/Bad but in a funny or entertaining way)
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Sorority Row
Pathology
Orphan
Piranha 3D
Hatchet 1 & 2
Free On Cable/If You Are Truly Bored
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Triangle
The Broken
Paranormal Activity 2
Pulse
People Under The Stairs
Prom Night (remake)
Vanishing On 7th Street
Sanctum