Put a classic Godzilla movie and Neon Genesis Evangelion in a blender, and you have this baby.
Giant robots fight giant monsters. Humans mind meld with each other, with machines, and with monsters. An oil tanker gets broken over the head of a walking hammerhead shark the size of a skyscraper.
The premise is absurd, but this is one of those movies that knows this and makes it work, without the nauseating self-conscious of lesser films. It's balls-to-the-wall intense, and while it's imperfect, it's just too much fun for its blemishes to count for much.
Can't recommend it enough.