To say it clearly : That's the LEAST you should do! 
That's the only way to enjoy new series before everybody
tells you the end of the serie. Think of the number of
fans who were disapointed with Eva (some of them because
they DIDN'T know, but).
Anyway, learning japanese should be natural for every fan
of animation. (and for those who love video games too)
Don't you think?
	Pierre