i think the army/navy game is important, if only for the national attention it brings to the table for our armed forces.
in reading hat's posts, though a bit harsh, his main point, which i would agree with, is that it doesn't mean anything in regards to the football season as a whole, and the football isn't really all that great, and it hasn't for a long, long time.
that said, i don't think there's anything to dispute that it is a huge rivalry game for those two schools/academys. and taking in to context what the kids on those teams will be doing after football, and understanding that will far out weigh anything they could ever hope to do on the feild, then yes, it does mean something.
just not to college football, as a it pertains to rankings and championships.
in that respect it's set apart from any other rivalry in college football and is worth noting, because when that game is played, you go into it, as players, fans etc....knowing there's nothing else on the table except pride.
so in the end, it just depends on what's more important to you. for those two teams, generally speaking, it's simply being able to say "beat army" or "beat navy".
for all the other games mentioned in comparison, the outcome has more emphasis on future goals pertaining to the season as a whole.
in that respect, the army/navy game isn't comparable, which is why it's unique.