Given that a great many studies done these days are not reproducible, I have trained myself to be skeptical of studies in general. How many studies have been done that back up the Women are Wonderful phenomenon? It makes sense, and a lot of my criticism of modern feminism is based on this principle... but how much actual data, and how solid is the data, that backs this up?

To anyone who hasn't heard of the Women are Wonderful Effect, it basically states that women have a positive ingroup bias towards other women. Men on the other hand, have an outgroup bias in favor of women as well.

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The "Women are wonderful" term was coined by researchers Alice Eagly and Antonio Mladinic in a 1994 paper, where they had questioned the widely-held view that there was prejudice against women. They observed that much of the research had been inconclusive in showing a bias. They had found a positive bias towards women in their 1989 and 1993 studies, which involved questionnaires given to students in the United States.

Another study:

Rudman & Goodwin (2004)