Crowsnest is an entirely generic slasher movie. Does any of the following sound familiar: lost in the woods, poor cellphone signal, watching people's boots while hiding underneath things, strange little girls, cannibal hicks, and 'we've got to keep a record, like, for the police'? Then you have already seen Crowsnest.
You're Next is much better though not super original. Unlike Crowsnest, which is just drawn out, You're Next builds a lot of very good tension, and features a really competent female protagonist, as well as a bunch of total assholes who you're not super upset to see die. I've seen better home invasion movies, but if you feel like watching a movie about dudes trying to get in your house, this is some quality dudes trying to get in your house.
Boxtrolls is the weakest Laika movie so far, but it's still a damn good movie. It's a bit messy with what message it's trying to get across (there's two or three) and some of the adult characters feel more caricatured than usual, but those are really the biggest flaws in an inventive and well-crafted movie. The jokes are good, the animation is fantastic, and the designs are great. Still worth watching if you're into it, but I wouldn't, say, recommend it to my non-animation-nerd friends like I would with Paranorman.