I think they're pretty bad, honestly. They are seldom more than wish fulfillment self-inserts.

I mean, they can be done well. If the "wimpy male" has a less than ideal situation that could create some drama. Maybe all of his suitors know he's incredibly rich, and his parents just want to marry him off. Or maybe all of the girls are spirits/demons of some sort that want his soul for whatever reason. Or perhaps the guy actually is really desirable, and the girls that are after him aren't, and try to make sure better woman don't come anywhere near him. Making the RP about the girls interactions with each other would also make things more interesting for them as players.

But if you're more interested in making a fantasy than a story, maybe try the 1x1 section.