And that means what in the grand scheme of life?
I go out to a tennis court, try to play the best to my capability, enjoy the comraderie, enjoy the good shots, try not to get too aggravated by the bad shots and then have a beer after. Its pretty simple. If I can do that with my spouse and some friends all the better. I don't have higher aspirations than just trying to play well no matter the situation, men's, mixed or otherwise.
You do realize that in mixed you do have to face a man's serve and return at least half the time. There's enough good men playing mixed to give you a good challenge. And I've played some 4.0 mixed teams that are a far greater challenge than facing my 3.5 men's doubles opponents.