I have seen the previous movies in this series and I knew what to expect from this one. It ended up better than those expectations, but that's not really saying something.
Step Up Revolution is a bad movie centered around dancing with a screenplay I could've written in one day (that's not a good thing).
And no matter how amazing the dance sequences are, the film also contains flaws that you can't overlook.
First of all, the 3D. While it's really good throughout the film, it becomes quite shaky during the dance sequences.
Next up, the soundtrack. The best thing about the first Step Up was its soundtrack. It featured some amazing songs and I myself purchased it even though I hated the film. Then came Step Up 2 The Streets and it featured Flo Rida's still memorable song "Low". Later came Step Up 3D and it gave us the club anthem "Club Can't Handle Me" (not sure of the name, look it up). However, I can't remember a single song that was present in the last installment of the series - save for M.I.A.'s "Bad Girls" of which only one verse was featured and not in a proper dance sequence.
Third of all, the acting. The Step Up series isn't really known for featuring good actors. And as the series grew, the acting didn't actually progress (they went from Channing Tatum in the first movie to an actor from Glee in the third one and to an unknown cast hoping they'll go mainstream -they won't, hopefully- in this one. You do the math). I'd like to note that a certain actor, Misha Gabriel, gave an absolutely abysmal performance in the movie and that should not go unnoticed.
Fourth of all, the script. OH EM GEE, it's so lame I could've written it (yes, I really suck at writing scripts. Even worse than writing reviews). For example, the last dialog in the movie is "Why Moose?" to which Moose will reply "Why not Moose?". You get the point.
And last but not least, the story. I wasn't really expecting a whole new not cliché story, but at least a believable one. Okay, so there's this competition, as usual , and a dance crew that's got a lot of chances to win the competition, as usual , and a new girl that comes into town, as usual , and she falls in love with the leader of the crew, as usual , and she enters the crew, as usual. A bunch of stuff happen and the couple fight and the crew breaks up but everything gets better and they all live happily ever after. However, the stupidity resides in the details. Now, as usual , they are too bored to create too many character so obviously the main girl has no mother and the main big has no parents whatsoever and lives with his sites who has no husband but a daughter (because yeah there must be a little girl in the movie). And yes the main actor is so hot and has to take off his shirt at every opportunity, as usual . Sometime during the movie the big bad man decides to buy the town where the dance crew lives. And the man turns out to be - PREPARE YOURSELF, BIG SURPRISE COMING - the hot girl (who just entered the crew)'s father!!!!! And she won't tell them because yeah it will make things worse and yeah they hide a camera in the middle of the room and catch her talking about her father and she won't notice the camera because yeah she's as stupid as whoever wrote the screenplay and the crew gets mad and they want to avenge their town. Oh and yeah they love their town because they are all very poor. But hey, wait a minute. Aren't they poor? Eum, why do they have a super big warehouse, ten thousand Macs, a hundred thousand DJ sets, ten million HD cameras and yeah a motherf-ing boat. You read well. The poor guy who doesn't have a house has a boat! I don't even have that many stuff... Okay now, let's move on. The people who live in the town that's about to be bought by the big bad man are only notified last. Like "Yeah we're buying this town. You should leave tomorrow, you're not getting any money. Okay bye." How stupid do you expect the audience to be?! And it's only in the last scene that you get the only good thing in the whole series (Moose) and it's just a cameo. There's also a bunch of bad stuff but writing this review really overwhelmed me and I don't feel like pointing anything else out.

Bottom Line : Step Up Revolution is a bad movie that's only enjoyable if you watch the dance sequences and skip every thing else.
1.5/5 ... 1 for the dancing + 0.5 for Moose