Kung Fury succeeds in what it's trying to do. Being a over-the-top homage to 80's action silliness.
I have heard it being said that it tries too hard, and it does try hard, but again, that is also sort of the point. With its short run time, almost every scene is a spectacle in some way.
Kung Fury is about a half hour long, and it's fortunate that it isn't longer, because that would have been triple overkill. It's the right length.
Not all the humor hit home with me, but I am a tough crowd, when it comes to humor. And I'm sure most people does think it is very funny.
Kung Fury has several really cool action sequences, and I really love the wonky style it is made in. You can clearly see that, I assume pretty much the whole movie, is green screen. It really fits. The effects are overall executed well, it's not WETA-quality, and it doesn't need to be, actually it probably shouldn't be. The style works very well.
Not going to say all that much. Bottom line is you can't go wrong with this one, nothing here is serious, and should it not be your cup of tea, it only lasts 30 minutes.
Big plus for one of the fighting sequences, made to look like it's one long take, (you'll know when you see it) it's like 300 meets Old Boy meets Mortal Kombat. It is without a doubt the single best thing in the whole movie. Truly awesome. More scenes like that one, and it would have scored higher with me.