Women tend to be more motivated, dedicated and professional in my opinion. As for not being as able mathematically and technically - well I think that is not true.
If there is an increasing number of females being employed, and I think in many UK airlines this is the case then I think this is due to the above factors rather than any positive discrimination.
As for flying with them, in my company those I have flown with are generally a joy to share a day with - competent, relaxed, confident and personable. Long may it continue.