Mercy wasn't necessarily a bad film, indeed the opening twenty minutes or so were rather intriguing, a nice build up, good motives for family feud, but once it started unravelling it transformed into nonsense. At times I was reminded of You're Next, but at no stage did it reach those levels of gripping excitement.
It wasn't difficult to follow, but the realisation of who was behind the home invasion was dealt with in a way that you can only describe as heavy handed, the reveal three quarters of the way through was very silly, I couldn't take it seriously. Too many unanswered questions at the end, were all brothers aware of what was going on? Never fully answered.
Quite well acted, with decent production values, the masks were very effective, but with those, as with the rest of the film, there's nothing new here. A little flat, 5/10