Well no, I don't agree. I didn't watch that match but I'm pretty much sure Lindsay must have played amazingly GREAT and Sharapova was in day off or something like that.
Its not that you see 6-0 6-0 scorelines in women's tennis too often either, specially among top players. It wouldn't be so surprising if not.
The reason why in women's tennis the players can't hold serves that easily is because of the power of the serve. It's not the same returning a 130 kph serve than a 180/200 kph serve for either women or men. I don't see the William sisters losing their serve game too often or at least as often as the other women players on tour.
I think female tennis and male tennis are two completely different things. You might like one and hate the other or like both. I like both. And as a woman I feel affected by that comment ("wta is a joke").
That's all I had to say, specially the last thing