Ummm .... 10 lines of text and no reference to the most important change: US subs in the Pacific vs. UBoots in the Atlantic :hmm:
I might of course be wrong, but my approach has never been the "Sh3 vs. SH4" comparison, but instead: Get SH4, load it, see it: What do I like/don't like?
SH3 is a great game for me, sure, but hell it's a game about UBoots! I don't like to draw comparsons between both because it ends up being a german subs vs. US subs thing, and that is NOT the idea....
Let me make a littel suggestion: Forget SH3, load up SH4 again and just put your mind in the Pacific. You are an american, a lucky bastard in command of a crappy S18 sub and the japanese are invading Philippines after a coward surprise attack against your beloved and paradisiac Hawaiian islands....go out there and blow them!! SH3? What is that?