[Matrixbeast]

OT has it subbed now, BTW.

EDIT:
Watched it.
Was it good? No.
Did I enjoy it? Yes.

Me, being super critical minded and well versed in my disdain for Gokai and Decade, I'm not going to bother with any sort of full review, so I'm gonna keep it short.

First off, the name is a lie. The only Riders with any sort of prominence are OOO, Fourze, and Decade (The opening with the Legendary 7 hardly counts as prominent appearance), and the only Sentai are Gokaiger and Gobuster (Only towards the end).
Marvelous and Decade's war wears thin when, outside of group shots, the only time we get to see Riders/Sentai in action are when it's Marvelous or Decade doing so (That or they get killed off like chumps. I saw you Kabuto, just staggering around until you got absorbed into the purple dimension).
As for the character themselves, it's not actually a betrayal. Joe's emotions controlling him isn't out of character. His actions regarding Cid/Barizog were quite similar, and Marvelous is essentially filling in that role again. His best friend, mentor, and ally being turned against him. Kaito's actions at the end were freaking retarded, but I guess when Decade was his only friend, he was just trying to show what it's like to be hurt. Hina was just Natsumi ver.2, and Don was there too.
The action itself was decent, but this movie made it painfully obvious when the losing character was going to get hit (You know, when they spread their arms out wide and just stare at Decade/Gokai Red until they get slashed and sent to the Ooze). The climax (Or rather, the first one, with everyone showing up) was great, and seeing a rainbow of an army charge was awesome in the Legend War and it was awesome here.
Speaking of, that climax was great. I DESPERATELY wish we got to see more Rider/Sentai interactions. Seeing Urataros try to seduce Geki Yellow made me guffaw with laughter, and watching Hibiki and the Magirangers take out a group of enemies was just awesome.
The OOO Gokai Change was wasted and pointless, and Gosei giving Decade, Blade, and Ryuki their cards was brilliant (I loved that part).
The actual Climax (Involving the Big Machine vs. Go-Buster Oh and Fourze) was decent, and the ending with Gai's spastics was fun.

Overall, it's a fun film that takes itself too seriously, but that doesn't mean you can't have fun while watching it.
(Also, Long was totally in this film. Despite the fact that he's not dead...And out of risk of spoilers, I'm not saying who Long is and which series he's from)