I love the gameplay in Xenosaga and I have no qualms with the movie to gameplay ratio issue. Here is how that goes in XenoSUCKga.

* = Movie
# = Gameplay

*********#********###**********###*****###****##****#######****##########*#*######*##**############# #####*****##################*****#####################

It goes from one end of the spectrum to the other by the time you beat it.