I honestly don't remember large chunks of sinister especially towards the end, but everything to do with the MC finding and watching the tapes is absolutely harrowing. I remember being so tense watching this guy in a dark attic (where anything could pop out) watch that super creepy silent footage. The slow motion ghost children stuff didn't do it for me nor did the ending (it makes sense, just that it didn't spook me) but man if the bits with the footage and the footage itself arent incredibly well done and creepy. Agree, sinister is underrated for sure. It's also one of those movies really enhanced by cutting away before the gore hits, aka 'yard work'