These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Naval Ops
Complacent Gaming Syndrome: Once you have a reasonably fast battleship fitted with anti-sub missiles (and the usual battleship guns), there is little reason to use anything else.
Crowning Moment of Funny: In Naval Ops 2: Warship Gunner, you get special missions after beating the game once. In each one, everyone, except, perhaps, the captain, acts like they've just taken a hit of something. Let's see, Tsukuba is now openly going afterthe captain, and is quite obvious about it. He also calls your Bridge BunnyMs. Eye Candy. Werner, a fellow XO, is also going afterthe captain, and he's revealed to have taken a liking to predicting the future. With every kind of method known to man, including talking to his dearly departed Aunt Betty. Braun, a female scientist, also in the race for the captain's attention, was revealed to be an 80s movie buff and apparently weighs a lot more than she looks. Oh, and said Bridge Bunny? She's a Manipulative Bitch now. And of course, you get to fight a dried squid. KOEI has a pretty weird sense of humor...
Shulz (The Captain): There goes the fourth wall...
Braun: Maybe it's a kind of Zen thing. Like, is a ham a key?
Tsukuba: No. A key is made of stronger things. Like salami. And Cigar! (and later: "Prepare to lunch attack!")
Shulz: (to Tsukuba during the escort mission) What kind of cruel twist of fate would make me end up with an old man like you?
This all discounts the rest of it all. A showdown with Drillships sees all three of them reappearing. The Amaterasu ("Forgetable Middle Brother") even calls the crew out:
Amaterasu: Haven't you played the last Warship Gunner game?
There's also the exchange between Schulz and Werner in one of these missions...
Werner: Here I am! Come and get me! Hee hee!
Schulz (playing along): "Oh, c'mere you!" Is that what you want me to say?
Werner: Aww, you're no fun Captain, don't make me go to the tabloids! "Read all about it: Captain's Groovy College Days! Afros, Aphrodisiacs, and Hermaphrodites!" Think of the scandal.
Schulz: MAIN GUNS TAKE AIM! Blast him until we're out of ammo!
Goddamned Bats: The PT boats, tiny little vessels that serve no purpose aside from swarming all over the place and bumping into you when you're trying to deal with other, larger ships. Much later on in the game they start firing lasers and homing missiles, mount shields, and break weapon locks, effectively upgrading them to Demonic Spiders. Even better, they sometimes have high-level jamming and EM shielding, meaning you can't use homing weapons and lasers on them.
Nightmare Fuel: Ragnarök's orbs of destruction. Those things are faster than 64.6 knots and, when they're fired, they emit a very weird sound and start to pursue you. The only way to escape is if you have thrusters or enigmatechs.
Scrappy Mechanic: In the first game, you have to physically retreat from the map after completing the mission, possibly while under fire from an entire fleet. Every subsequent game allowed you to just choose a "Return" option from the menu. Also, point defense weapons did not fire automatically; you have to engage intercept mode, which prevents you from using offensive weapons.
Ship-to-Ship Combat: Well, it's about warships destroying each other, but the Escort Special Mission it's a special case of this trope.
Tear Jerker: If you let Tsukuba perform the Heroic Sacrifice in the third mission, you have to fight him later in the game. It's pretty sad to sink his ship, since he would refuse to abandon his ship.