Princess Rouge

Princess Rouge is the better definition of mediocre. The story is a harem with the typical plot ordinary boy found amnesiac superpowered girl. This has become pretty common since the Oh! My Goddess' success, but, despite some good examples of this plot that can turned into some great titles (Chobits, Elfen Lied), this is not one of them.
First of all, the characters. Many people say that, to have a good show, you must have good characters. There's actually more things, but have good characters is important. This show fails at that. Your ordinary MC is too ordinary to be interesting the most remarkable thing ... about is that he's an orphan, and all the rest of the characters are bland, since the innocent but so powerful she doesn't know magical girlfriend, to the two sisters, one who is a Naru Narusegawa's clone in character and personality, and the other who at lest is nicer than her sister, and don't forget the awful crybaby annoying human girl who has a crush on the main character, and when he discover he has a girlfriend, she runs and cry, because how he dares to have a girlfriend? She even send her friends to beat him. Hilarious high-comedy, ladies and gentleman.
The humor is pretty Love Hina-style, guy lives with a bunch of girls and awkward things happens, and the male lead is beaten up in a pretending to be funny slapstick way, but it's not even bad enough to criticize it. It's just boring. There's some scene we could call fanservice, but i don't think anyone who could have a bonner with scenes so lame, repetitive and unoriginal.
But this is not only an harem. Much harems and ecchi shows try to hide what they are with a premise to another genre. It's also a fantsy magical girl warrior show, the female lead and her sisters are the lost princesses from the underworld, whose family has been killed and they run away, and the big bad want them to...kill them? release some mysthical sword we never see or get an explantion why is sealed and the villain want it? The fights are as boring as the comedy, and the villains are really uninteresting. The main villain is your typical dark lord we never get what his motivation was, and his minions are really lazily written. We're supposed to care about a villain dude who died in the second episode, but how can i give a fuck about someone who has appeared only in one episode and his story was writting in a really clumsy and lazy way, with clueless flash-backs shown too late to make people empathize.
The art is your typical late 90s style you could have seen at shows like Slayers or Saber Marionette J. The music is that cheesy 80s music that sounds extremely dated, even more if you think this OVA got released at 1998.
Princess Rouge is a pretty obscure and forgotten title. Actually, in the scale of anime obscurity's TV Tropes page, is on level 6, the highest obscurity level possible, and not even the japanese Wikepedia has the title listed in the J.C. Staff's page. But with a good reason. It's that kind of forgetteable. It's not even awful worth it. Just a mediocre show that attempted to try to have a level of success because similar shows succeded.