From a screenwriting perspective, this is not a good movie. The script, riddled with a textbook of cliches, exists merely to make an excuse for nifty effects in a string of prolonged acton scenes, with the exception of breaks (what few there are) to develop character. Everyone of the cast looks like they're having a blast, but their characters are so thin as to be paper cut outs. It has no unique personality or food for thought, but, simple is the way to go with these kind of old-school adventure flicks.
Part of Journey 2's appeal is that it doesn't get brought down by an overly complicated script. It moves quickly, and the action is surprisingly really fun to watch. I also must give kudos to the effects guys. The 3D gimmicks get tiresome, and the effects are not always sublte and seamless, but a lot of effort was clearly made in creating this immense and fantastical world. Andrew Lockington also provides us with an exotic and thrilling score that features some of the most addicting and original musical themes I've heard in years. Patrick Doyle better watch out, because Brave is facing some steep competition as the best musical score of the year.
CAUTION: Awesome score!
You still have to turn your brain off to enjoy it, but it should be a pleasant diversion. It may not be very memorable, but I never got bored while watching it.
*** / *****