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.
Ear Worm: You try getting Geki!Tei out of your head. Bonus points if the dance has become reflexive. Yes, there is a dance. It even shows up in the manga as an occasional joke.
First Installment Wins: Note the amount of attention the first game and the Teikokukagekidan get in terms of adaptations and even information on this page. A character page has been started up recently, but it's still got a ways to go.
Les Yay: In the first game, Tsubaki has a crush on Maria, as shown by the Let's Play referenced below. Several other examples exist.
Moe: Most of the main female cast you can romance is this, but some stand-out examples include Erica and Rikaritta/Rosita.
Nightmare Fuel: Python, the true form of Karuchera from the third game.
Seinfeld Is Unfunny: While not as bad as what happened with the Tengai Makyou series (another franchise created by Ouji Hiroi/Hiroshi Adachi), the selling point of this franchise is playing a game who was like watching an interactive anime series, especially in the 90s. Now, the games and the concept looks dated compared with many other ones who copied the concept and expanded it.
Tough Act to Follow: Let's say Ouji Hiroi's career took a serious hit after the franchise was finished (along with Tengai Makyou), since he hasn't being able to create another successful game or franchise again. His last game he worked as an Otome Game for girls who is basically a Follow the Leader version of Hakuōki and it's even more obscure than his previous works. On the other hand, this was averted with the rest of Red Entertaiment, since they're still making successful games, like Valkyria Chronicles and Gungrave.
What an Idiot: YMMV a lot on NISA for selling the fifth game with no sure degree of success in the same month that Final Fantasy XIII came out.
On the other hand, it did get a lot of good reviews including an award from IGN.
The Woobie: Hanabi. Her fiance died on their wedding day and Hanabi, for a year after his death, visited his grave every day.