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.
WARNING! A HUGE BATTLESHIP "SUBJECTIVE TROPES" IS APPROACHING FAST.
Broken Base / Internet Backdraft: Darius Gaiden. Is it fair to play the game with externally-assisted autofire that outpaces the default rate? Should high score threads for the game on Shoot 'em Up forums allow or disallow it? Two questions that are often followed up with responses comparable to Mario Kart snaking debates.
Crowning Music of Awesome: Zuntata, Taito's in-house music group, did a fantastic job with the games' soundtracks, including lots of sampled opera and the second boss-fight's music in G-Darius, "B. T. Dutch", containing the sounds of power drills. Listen to it here.
Super Darius II took the original Darius II soundtrack and made it incredibly dramatic and awesome.
Fridge Brilliance: Darius Force's soundtrack sure gave odd names to the tracks, right? That is until you realize that the words correspond to the zones they play in: "AKing", "BIO", "CH a NG e", "DEF end" (Zone J is not represented), "L a M e".
The Darius Burst boss Dark Helios (an oarfish) transforms into the dragon from Syvalion when defeated. Sounds strange, until you find out that the oarfish could have been the inspiration for the Eastern dragon.
Nightmare Fuel: For a game series against deep sea creatures, there's surprisingly little of this with the setting itself, but some of the tracks for later game series can be...unsettling. Galst Vic from Darius Force and Dada from G-Darius.
Heck, Galst Vic himself. The one time we get a boss not based on marine wildlife, we get...a frickin' skeleton-like thing that resembles a Terminator. And just when you escape the base and think you're home free, its dismembered head comes back for one last stand!
Porting Disaster: Darius+ (Not to be confused with Darius Plus) requires damaging the boss-vessel components in the correct order, some of which were near the back of the enemy. In this version, you also get stuck with a limited-range pea shooter if you get killed - even during a boss fight.
That One Boss: The series' bosses are known not only for basically being huge mechanical fish, but also being very punishing too. Those that come to mind are Great Thing (in all appearances), Fatty Glutton (in all appearances except Burst, where he's the easiest final boss), Titanic Lance and Storm Causer from Gaiden, The Embryon from G-Darius, etc.