The ending to lysistrata?

I was quite disappointed as the book ended as I expected, how the men would resist at first but give in at the end. I didn't like that people were dancing and singing and the end, not that I don't like happy endings, but I would of perfer of some twist since this a comendy. And when we were doing this in groups, the person that summarizes, comes up with question etc, the predictor in our group also hated predicting because it wasn't a surprise that their was peace in the end. I mean that still made this a great book, with all of the comedy, but it felt like I was reading the ending again because I knew what was going to happen.
Still compaing the ending to the other two books, it still beats them, becasue it wasn't a peaceful ending. Well, I mean that the ending wasn't bad, but it was like sooooo expected. I didn't see that the women in the other two plays were going to commit suicide. Please can people tell me what they thought about the ending?