I thought The Ruins was above average for a horror, not great, but above average. A horror film I quite like but doesn’t get a lot of ink is Midnight Meat Train. A young Bradley Cooper stars and there’s a cameo by Brooke Shields. The director is Japanese and it’s based on a short story by Clive Barker. It’s a great ride, but the ending is something of a let down IMHO. You decide. The original Wicker Man is also a good film–very creepy. I also like Demons (1985)–Dario Argento wrote the screenplay–and Argento’s Deep Red.
As for novels, run, don’t walk, to find Infected by Scott Sigler. You’ll thank me 