Edit: Oops, had a bit of a mix up with Evil Dead (1981) and Evil Dead 2 with some of the scenes. The missing scenes are beside the point though.
From watching the original made in 1981 to the one now in 2013, quite a bit has changed. Let's start from the beginning of the movie to the end of it and nitpick along the way.
The opening to this movie actually had me laughing and wondering what the fuck was going on. Literally at 4:54 in I was laughing. The opening was entirely pointless, it gave little to no explanation about the story later in and was unnecessary. All that tied back to the opening was the fact that the Book of the Dead was there and the continuity of the dead cats in the cellar. And time for the nitpicking: the blood colour wasn't anatomically correct. I hate to be that picky, but that was the colour of dried blood which really set me off quite a bit. True they could tie it in to the fact that it might have been demon's blood, but they didn't. I'll complain about anatomy later though when it truly gets terrible.
Now we did get get a bit of reference to Evil Dead 2 when Mia fights the Abomination with a chainsaw, mostly due to the fact that she is holding it by a single hand and stub. The movie does reference Evil Dead 2 quite a bit in that regard, which is a problem because one is not two, both are different because they have mostly different people who try to survive.
Speaking of the Abomination, why did they change it's design so much? I mean sure it was a remade movie, but that doesn't mean that we have to make the Abomination a Titan (From Attack on Titan). That is what the design literally felt like: high body temperatures, tall-ish appearance, no genitalia, all too familiar.
There was another time when they referenced Evil Dead 2 was when Natalie's hand was possessed by Demon Mia's bite. But they changed it slightly when they had her cut off her arm instead it made it look like they wanted to steer away from the cameo or even mentioning of it.
A third cameo to Evil Dead 2 was after the credits where Ash turns to the camera and says "Groovy," afterwards the movie ends. Now, a source does tell me that there was a longer scene of this planned where it was slightly more elaborate and lengthy but instead all we got was just a catchphrase. Whether you want to believe that this was planned or not is up to you.
And now we get to the anatomy which can be summed up in one word: Horrendous. Not even going to sugar coat this one, the anatomy was BAD. Mia's hand is crushed under a car? She tears it off with no bone visible or even a mention of, nothing but flesh and veins. Even when Natalie cut off her arm it just fell off with no bones, the saw even cut through like there never was any bone there. When Eric was attacked by the nail gun no bones were there either, just thick flesh. Even after taking a crowbar hit THROUGH his hand like a champ there's still no signs of bones. The only actual mention of bones ever in this movie are when Mia bites Natalie and when Olivia is carving her face, even then that's the same bone: teeth.
And let's not forget some lack of continuity. The more noticeable one of this is after Eric takes a nail barrage and a crowbar beating through the hand. The nails have no known effect after Eric leaves the main room, even his hand somehow regenerates and is made whole again even though it was SPLIT DOWN THE MIDDLE. Let's not forget about Grandpa's disappearance after David leaves the shed to go confront Mia, he's never seen throughout the movie again, not even as some kind of hell hound.
Considering it's genre the movie wasn't even scary, the only part where I was actually afraid was when they hinted that Olivia was going to cut her face off, instead she just carved it.
Ending the rant and wrapping this up, this was actually pretty bad. Went in with some expectations came out with sad times. So I give this one a 3/10. Really could have done more but just didn't take the opportunity to do it.