These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Eden Lake
Jerkass Woobie: Steve, and most of the chavs themselves. Cooper in particular.
Moral Event Horizon: The gang crosses it when they torture Steve, taking turns slashing him with knives, and finally cutting out his tongue. During this scene, Brett doesn't do any torturing himself, but forces his "friends" to do it while filming the whole torture. Cooper is even crying when it's his turn to cut up Steve, but he still does it.
Unfortunate Implications: There is a definite and resounding class aspect at work between the civilised and virtuous middle-class victims and the feral, brutal and sadistic chavs and their families which can make this very uncomfortable viewing.