Otherwise a realistic naval engagement would have seen missile and counter-missile warfare overseen and managed by naval AWACS,with manned squadrons playing chicken and decoy runs around the aliens' sensor horizon. It would have been Sea and airspace contest centered on carrier strike groups, with Aegis ships and attack subs dashing down approach channels swept by ASW and CAP, launching wave after massed wave of SLBMs and ALCMs and Harpoons distributed and timed to arrive from most points of the compass, perhaps with a few land-based ICBMs thrown in to stretch the aliens' defenses. But this would be boring cinematically.
actually it wouldn't have been boring at all, consider Transformers when they called in the air strikes during the desert battle.
best scenes in the first Transformers by far.
to the first portion of the quote, realistic would have had the aliens hit from space well beyond our range and none of earths toys would have made any difference, that would have been boring...... or they would have come to earth and shot all of our toys out of the air before impact then slaughtered us wholesale at which point they'd get sick and die because earths germs turned out to be made of sterner stuff.... lol oh that's been done.
the problem with Battleship is that it was a bad idea all round, really makes me wonder how it ever got funded.
Splitting hairs is the source of every prolonged discussion on the web.