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: Texas Chainsaw 3D
Darkness-Induced Audience Apathy: As the film goes on the only good characters either die or turn evil, to the point where there are no more moral characters. As a result, when the climax comes, we don't know who we're supposed to be rooting for, or more importantly, why.
Designated Hero: Heather, after she sides with the Sawyer family, whom she knows nothing about except that they like to kill and eat people on a regular basis. She actively tries to help save Leatherface despite him slaughtering countless innocents, including her friends, and the audience is to believe she's doing the right thing.
Designated Villain: The people of the town are portrayed like this for burning down and murdering the Sawyer family, regardless of the fact that the Sawyer family is made up of cannibalistic and sadistic monsters, but Leatherface and Heather are played as the Lesser of two Evils.
Fridge Brilliance: Notice the tagline says "Evil Wears Many Faces" ? At first, one could say this refers to Leatherface's masks. But examining from the plot you'll notice Leatherface and his family are not the main antagonists of the film, rather Burt Hartman and his goons, the film also has plenty of Asshole Victims and the protagonist has a Start of Darkness.
When Heather reads Verna's letter, one of the sentences was "He's yours now". The brilliance of that scene comes when you take into account that Verna is played by Marilyn Burns, who played Sally in the original. And since the sequels that are rumored to be in the works are set to continue Heather's story, this is a symbolic Take Up My Sword from one Final Girl to another.
Jerkass Woobie: This depiction of Leatherface, considering his predicament. Also Heather, whose Face-Heel Turn is frankly understandable, given the kind of shit she went through.
Narm: This film gives us classic one-liners such as "Welcome to Texas, motherfucker!" and "Do your thing, cuz!"