CONTAINS SPOILERS AND INTERGALACTIC LEVELS OF BAFFLEMENT
The most pressing question about this isn't whether it's any good or not (it isn't), or whether it's faithful to the original source material (don't know, don't care) or whether it's worth a hundred million dollars of studio money (it isn't). I got to the end of the movie just wondering: who's it for? Who's the audience for this? Who the hell has been sitting around for nearly a quarter of a century itching for a Power Rangers film? And specifically who's been sitting around itching for this level of stupid, this level of witless, this level of utterly uninteresting... Who is this aimed at? Like Teenage Mutant Ninja Turtles, this is supposed to be for children, and you surely shouldn't be getting excited by Power Rangers once you've started wearing long trousers.
I don't know, because I never watched it: maybe this is an entirely accurate distillation of the Mighty Morphin Power Rangers TV show (156 episodes from 1993 to 1999) and/or the 1995 film version. This incarnation is, as has been pointed out so often, The Breakfast Club meets Chronicle: five teenagers from detention discover some weird alien tech and immediately gain superpowers. In fact they're destined to defend Earth from the ancient alien menace of Rita Repulsa, whose body just happens to have been discovered that very day by the lead Power Ranger's dad's fishing boat. She promptly wakes up and starts her quest for the Zeo Crystal, which is the source of all life on Earth and therefore we need it; she has Goldar, a thirty-foot gold robot sidekick and several rock monsters (called "putties") to assist her in digging it out from underneath the local doughnut shop...
It's not just that it's utter rubbish (though it absolutely is), it's not just that it doesn't even make any sense (how did they get home after a massive car smash?), it's not just that the Famous Five don't get their colour-coded armour until three-quarters of the way through the film, at which point they get access to their individual Zord vehicles, four of which are big stompy dinosaur things and one of which is a fighter jet. That's also the point at which the whole thing becomes a Transformers movie with the Rangers teaming up into one giant robot thing to fight the giant gold robot sidekick while Rita demolishes her way through the town. It's that it completely and comprehensively fails to generate any excitement or engagement at any point in its two hour running time.
Maybe it's because I'm no longer eight years old, but it's really impossible to get excited by Power Rangers as a concept, let alone this incarnation. The five Rangers themselves aren't interesting enough to hold the attention, and Bryan Cranston is only in it under makeup for about two minutes at the start and then a digitised face on the spaceship wall lamenting the Rangers' inability to bond as a team. Really Elizabeth Banks' turn as the villain is the only thing worth watching: camping it up in skimpy green armour (a gift for cosplay conventions) and ordering the destruction of worlds: she's having far more fun with it than we are. But as an origins story it spends too long setting up the Rangers and then doesn't do anything with them beyond splurging on the CGI for the big climactic beat-em-up.
Mysteriously, talks are apparently ongoing for a sequel, though that may be driven by toy sales rather than the poor box-office take. Mighty Morphin Power Rangers was never a massive cultural touchstone the way Doctor Who or Star Trek was, and given that the world wasn't exactly crying out for a big-screen reboot (and didn't take any notice when it showed up anyway), maybe this is a franchise that really doesn't need to go any further. Or, if it absolutely has to continue, do it for children, because (Elizabeth Banks apart) this has nothing, nothing, nothing to appeal to grown adults beyond the terrifying sight of one hundred million dollars being utterly wasted.