You're Next
I don't know why i bother with home invasion movies, they're all the same and are never scary. This one is no different. The cold opening was dull, the characters are annoying and unlikable and the acting is terrible. The villains are totally unforgettable. You can't just slap a mask on someone and think that makes them a good bad guy.
It gets a little better when the main character goes all John Mclane on the bad guys but it's ruined by the lame ending.
SPOILERS
From a realistic and logical standpoint, Erin definitely would've gone to prison even without the accidental shooting of the cop. There was no one left to back up her story that she didn't in fact murder everyone. That's one reason why i like monster movies better then slashers. You don't have to explain to the police why you're murdered some creature. But you're gonna have some problems convincing everyone it was self defense when the cops walk into a fucking bloodbath and you're the only one standing.
Other movies have been able to pull off the "character survives only to be killed by police due to misunderstanding" trope but this movie did not. It was an unnecessary ending which would've been better if she had just walked out of the house and it ended. Even with that ending she might be able to escape arrest since no one would've really known that she was supposed to be there.
END OF SPOILERS
Overall, it was interesting but not worth the hype it got. Basically mediocre.