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.
Game Breaker: Luca, a downloadable character introduced Trouble Witches NEO! has twice as much MP out of the entire cast as well as a significantly higher damage output than any other character in the game.
Narm: The English dub, due to the voice acting. However...
Narm Charm: Bad voice acting or not, you can't help but feel at least a little bit sorry for Lyla when she rants about how much she sucks in front of Lilly (until she starts crying, that is).
Anything Sakurako says also qualifies as Narm Charm. Her voice actress's accent makes her sound almost adorable.
Needs More Love: Especially from the developers themselves for butchering the XBLA version of Trouble Witches Episode 1 by abridging the storyline of each character and having SNK Playmore handle the English localization. This goes to show that there wasn't much love involved when they brought their own doujin game to video consoles overseas.
The English voice-overs maybe some of the worst voice-acting ever heard in a Shoot 'em Up since Castle Shikigami II, but the gameplay itself almost makes up for it despite its inherent flaws (e.g. the lack of card-swapping from the original PC game).
That One Boss: Lili. Unlike the previous bosses, she has a small weak-point that's only vulnerable for less than two seconds then closes her weak-spot off by some trap doors until it opens again. It doesn't help that Lily traps you inside her Eternal Engine form to restrict your mobility and she sends out spiked balls once her turrets and flamethrowers are taken out. Risking to go up close and personal to shoot her core during her first phase will likely get you killed (especially no thanks from the standard Xbox 360 controller's cruddy Directional Pad and analog stick) as she moves around the closed off space. And it gets worse when she Turns Red because will fill the screen with bullets with little room to maneuver through them.
They Just Didn't Care: The entirety of Trouble Witches NEO's! English localization and humorous storylines gone horribly abridged is proof that Studio SiestA did not care for bringing any coherent story-telling into a danmaku shooter outside Japan.
Averted with some of the voice cast. You can tell some of them are trying, but for the most part, they still sound terrible. Whoever was behind the voice casting, however, clearly could not be bothered with finding people who could act.
What an Idiot: Symphony, full-stop. If Ponta could say anything her pea-brain might understand, it might sound a little like this: "Would you stop for one second and look at the crown on your $%#&ing head!!".