There are two things - or rather people - to be cited in this film's defense. One is Angelina Jolie, who is pretty much perfectly cast (even if sometimes it looks like a primary school production of "Sleeping Beauty" somehow managed to afford an A-list celebrity - basically, she's too good for this) in what is made clear from the outset, a "retelling" of the story we know as Sleeping Beauty and made familiar with the 1958 Disney "animated classic", which is evoked throughout the film, namely in Jolie's costume and headgear. If Disney ever planned on a dark, "gritty" reboot of Mary Poppins, Jolie would be ideal for the lead role. The other contributor of note is Lana Del Rey, who provides a cover of the original film's love theme, "Once Upon A Dream":
These two are pretty much the only elements of the previous film that survive what is essentially a remake that is kind-of the Disney equivalent of the 2003 Texas Chainsaw Massacre "retelling" (even the ending somewhat resembles where 2013's Texas Chainsaw 3D took what was previously established as a classic movie villain).
After making her own contribution to the Disney "canon" with Beauty And The Beast (1991) and The Lion King (1994), writer Linda Wolverton penned the Tim Burton-directed Alice In Wonderland (2010), which was more of a sequel that acknowledged the original story via flashback rather than a simple remake. With this film, Wolverton develops a theme and takes a massive step down from the "prestige" of "Classic Disney" (rather than the other way round) by writing a film that, over a decade ago, would have been produced with animation fit only for the Disney Channel and sent straight to video (and would have stuck closer to the original film, too). Here though, we have a film that is a a dark, "gritty"(ish) retelling of a classic children's story that fits somewhere between Universal's Snow White And The Huntsman (2012) and Warner Bros.'s Jack The Giant Slayer (2013), but dressed in what Peter Bradshaw described in his review of Enchanted (2007) as "a cellophane shrink-wrap of corporate Disney plastic-ness" (http://www.theguardian.com/film/2007/dec/14/family.animation) and presented in optional (in this case, avoid) 3D.
As mentioned, this is a remake of-sorts but not merely the "Sleeping Beauty" story, nor the events of the 1958 film shown from Maleficent's perspective, but an origin story whose origin could be traced to the line in the animated film where one of the fairies suggests that Maleficent is "not all THAT bad" that gives some backstory to Maleficent, who is no longer the incarnation of evil but an orphan fairy and jilted lover of king-to-be Stefan (whose own character assassination sees him beg Maleficent not to curse his daughter, rather than order his guards to "seize that creature" and going mad. He ascends to the throne after drugging Maleficent and hacking off her wings in order to pretend that he killed her - understandably, she now seeks revenge as that is quite a cunty thing to do), which recalls the "wicked" Witch of the West's origin in Disney's don't-call-it-a-prequel, Oz, The Great And Powerful. It is during the first act that we are introduced to the concept of the "true love's kiss" on the 16th birthday (perhaps as Maleficent's inspiration for her own birthday gift for Aurora, which is now revised so she'll go into a sleep rather than death seeing as Maleficent is nice now so Merryweather doesn't have to come up with a counter-spell). Other references to the original film include the three "guardian fairies" (the true leads of the original, here reduced more to comic relief) being dressed in green(ish), pink and blue, and their leaning-tower birthday cake.
After the curse, we have the whole fairies-take-Aurora-into-the-forest thing and here, any tension of whether she will be found by Maleficent is thrown out the window as the film moves to focus on their "relationship" - Aurora (Elle Fanning, who is worth seeing in JJ Abrams' Super 8 and Sofia Coppola's Somewhere) grows up to assume this woman she met as a child is her fairy godmother and earns the "affectionate" nickname, 'Beastie' (as far as revisionism goes, especially with the ending, it's not far off the near-bestial romance of Catherine Hardwicke and David Johnson's post-Twilight take on Red Riding Hood but without the romance). During Aurora's growing into not-quite-womanhood, Maleficent sits by and plays magical pranks on the real godmothers. No, seriously. And in this version of events, her crow companion is granted the ability to shift shape (sometimes at Maleficent's command) so he can resume the human form of Sam Riley because reasons.
There is, perhaps, an interesting idea at the heart of the film, of having some connection between Maleficent (now more of an anti-heroine than a clear-cut villain) and Aurora (whose gift for singing is passed to Del Rey and replaced with the gift of never being sad - it didn't work) but only the idea itself is the really the interesting thing rather than the execution. Maleficent even tries to revoke the curse but, having bound it so no power could undo, she finds herself unable to take it away so even while she tries to rescue Aurora before it's too late (yes, really), whatever power works its magic works of its own accord and manifests a spinning wheel for Aurora (who is shown to have an irritation with her finger) to make the required prick to be sent into a coma. Furthermore, Philip (who here, is presented as even duller than the original and doesn't get to say "No carrots!") is proven pretty useless when it comes to being a "true love" (again, a somewhat interesting take on the story) and it's up to Maleficent to ultimately save the day and Stefan is dealt with in a shot that reminds one of Die Hard, of all films.
If the intention is to turn elements of the original story on its head (such as the prince being useless and setting up a bond between Aurora and Maleficent) then sure, but my concern is more to do with simply making the villain "nice". Another thing to point out is that Maleficent's fairyland of origin, The Moors (situated between two kingdoms), is initially set up without a monarch and by the end, Aurora is their queen. Go royalty.
And one or two more comparisons I shall make with the original film. The scene in the original where Aurora is drawn to the spinning wheel is actually quite creepy and the film pretty much turns into a horror movie whereas here, despite the CG monsters, there is nothing particularly scary (only one shot of Maleficent standing in silhouette warrants some merit). And talking of CGI, none of it is as impressive as the '50s-era design of the original's backdrops, which look very impressive in a bang-up restoration job on the latest Blu Ray release.