Saw them both in theatres and TBH was disappointed in both of them.
Insidious kept up its creepy premise but IMO really fell apart at the end, I completely lost interest for the third act. 6/10
Sinister had a better plot and some genuinely effective moments (specifically the found footage segmets.) Again though, like Insidious I feel like more could have been made of it. The demon was certainly a creepy creation and the little time he had on screen was very effective. I think my main problem with it was,
Again I would probably give it a 6/10, nothing special, but entertaining enough.