Agreed, and I hate like hell that it sounds like a typical sexist or chauvinist comment. I sure don't intend it that way, or mean it that way.
However, if a lady is going to call games, I would greatly prefer she sound like a lady, and have a somewhat attractive and pleasant speaking voice. It is also a requirement I want and enjoy from male announcers, when it happens.
Overall, I think ALL announcers should generally sound clear, pleasant, and be able to accurately describe what is happening and provide decent insight. There are also many male announcers I prefer not to listen to for the same reasons.
I suppose the issue is magnified by the proportionate lack of female callers in the business right now. Hopefully it changes or begins to soon.