One thing always happens after another. The screenplay is inventive and very funny. There are tons of cool little details and of original stuff. Sam Raimi's direction is brilliant once again. His camerawork is very inventive, and the awesome visual style he gives to the film is unmistakable.
Every shot is well thought and every scene is smartly handled.
The action scenes are extremely cool. They're well choreographed, like in Hong Kong cinema. It's both hilarious and exciting. They don't just wanna show that they have big computers and a big budget. For example, the skeletons are not top notch FX, but they have a cool personality and they do fun stuff.