The New York Times reported on June 15, 2008 that gay people who married in Massachusetts once that State enacted a statute allowing same-sex marriage report that their marital problems aren't really that much different from those experienced by other married couples.
In the four years since gay marriage has been legal in Massachusetts, over 10,500 couples have married, more than half of them in the first year after the new law was enacted. Many gays have found that marriage isn't for them and have divorced. Some have found it liberating to have recognition of their unions. Some have found that they argue about money, the in-laws, and about whether to adopt children or have their own.
The article interviews many people, and their views illustrate that folks in California who will marry under that State's new law will likely face the same learning-curves and the same realization that "marriage isn't for everyone."
You may read the New York Times article "Gay Couples Find Marriage is a Mixed Bag" here.