Actually, the Battleship / Destroyer thing is a lot more realistic as it is commonplace and easy to update an old ship with modern guided missile systems
I am talking about same tech level here, where all destroyers had were small artillery, which didn't even dent the heavy hull armor of battleships, and torpedos, which required the destroyer to be FAR closer than the battleships maximum artillery range.
- which effectively eliminates the relative size of the ships as modern naval combat takes place over long distances with the opposing sides never actually having visual contact.
Destroyers are avialable very early, these destroyers definatly didn't have guided missiles. These destroyers however can easily sink a battleship in Civ4.
I am not talking about modern naval warfare with Harpoons, but artillery&torpedo fights that happened during the world wars.
First hit wins in most scenarios, regardless of size (hence the reason that battleships have in the most disappeared from naval forces).
The reason battleships disappeared are the fact that regular ship artillery became outdated compared to heavy missiles. These guns were too large, took too long to destroy something and were far too inaccurate compared to these missiles. The battleship platform was no longer required as these missiles fit nicely on destroyers or even corvettes, the battleships simply became far too expensive.
I am quite sure that a heavily armored battleship could EASILY survive multiple hits still. These ships are incredibly hard to sink, even if you get a hole into the hull below water line.
so "First hit wins" is true - but only one way.
A well placed hit with a 15" or 16" gun could tear an unarmored destroyer apart.
A 5" destroyer artillery hit anywhere on the battleship could be ignored, as it couldn't penetrate the armor.
A torpedo (which can also be evaded, unlike artillery fire) would slow a battleship down and cause damage that can only be repaired in a drydock. However, it would take far more than a torpedo hit to sink a battleship