Complaining about Evangelion not being coherent is like complaining that the eyes on a Picasso painting don't sit right.
Picasso is a great comparison... although over the years I came to the conclusion that "Eva got lucky and painted 90% of a Picasso painting, then realised they weren't Picasso."
It's still an amazing series though. The fun is in the journey, and going through frame-by-frame to pick out all of the hints, all of the dialog, and coming up with the hidden meaning. For many years before the movie, all we knew was "they ran out of time/money and couldn't finish the last three episodes". Then they made the movie and we discovered "The chamber of Guf is empty".