Babadook was quite clever but nothing amazing, similar concept to Hitchcock's The Birds. 6/10 worth a watch in my book.
My personal favourites:
Paranormal Activity series (part 4 is the only dud...the rest are great, 1st one is scariest film ever)
REC 1 & 2 (best zombie films...watch in original Spanish with subs...avoid parts 3 & 4)
Interview with the Vampire (one of the very best book-to-film adaptations, makes you thirsty for blood)
Bram Stoker's Dracula (also great adaptation, makes you thirsty for Winona Ryder)
others which were really good:
Dog Soldiers (favourite comedy-horror this)
Open Water (utterly terrifying...not supernatural, tho')
Altered States (mix of sci-fi & horror...not scary but still powerful)
The Shining (slightly overrated, not scary...but still an engaging watch)
Rosemary's Baby (you feel so utterly helpless for the woman...horrific)
Blair Witch Project (finally saw this for the first time recently...a classic)
As Above, So Below (set in those underground Parisian catacombs...very atmospheric)