Gamertell offers a mostly favorable review of the hentai game, Princess Waltz.
From the review:
"Princess Waltz is a very text-intensive visual novel with a dash of eroticism. Most of the text is thankfully accompanied by Japanese voice-overs except for dialogue that originates from the omniscient narrator and Arata himself. Most of the battles that don't involve you require you actually use your noggin to visualize the frantic pace with the assistance 6th grade level vocabulary descriptions...
The story is charming, the characters are glistening, the card battles are fun but, unfortunately, all of its strong points are marred by the fact that this game progresses at the pace of a stepped on grandpa snail."