I rented Arcana Heart, played it for about 15 minutes, then sent it back to GameFly.
There's nothing inherently wrong
with the game. It's functional. It works. But there's no reason to pick it up over other similar games unless you are a registered sex offender. (Or because Melty Blood never got a US Release)
Seriously, the game just takes every stereotypical fetish archetype and randomly mashes them together in ways that don't even really make sense. Here are a few examples:
Absent-minded witch with glasses.Arcana Heart Opening
Large-breasted android waitress.
Dog-girl ninja wearing school gym outfit (shirt+bloomers)
Loli with cat-hears in her hair, wearing a swimsuit. (Ironically, she's the big bruiser character, because she fights as a giant humanoid ball of water that she swims around in.)
Demon girl (literally just Etna with bleached hair) on roller-blades.
Again, the nicest thing I can say about the game is that it's playable. It is a fighting game. But there's so little about it that makes it unique from any other fighter, that I would only recommend it to someone if they've completely exhausted every other fighter on the market. And even then, let know one know that you're playing it, lest you be branded for life.
...Wait, what am I doing here?