I prefer the fairer sex myself, and while I have no intention of becoming a parent (I was just sort of 'promoted' to one when my mother had another child when I became a legal adult!) I know that a lot of other gay/bi people desperately want children.
I think that if there were any problem to gay adoption, it would not be from the couple. At the very least, there'd be no more problems than what a straight couple would have. A gay couple can easily be more responsible than a straight one.
The problem would, ironically, come from straight people. Specifically, from other kids (and parents!) teasing the adopted child about having two mommies/daddies. It's still a new concept, so it's considered 'weird.' Even if the relationship is perfectly sound. This, rather than having two parents of the same gender, is what could harm the child. That kind of teasing. The taunting from children would be easy to see. Adults would snicker, point, and talk amongst themselves, creating paranoia.
I know the people who oppose gay adoption do so with good intentions. I know they're all concerned with the well being of the child. But I think a lot of misinformation gets spread on the opposing side. "We" tend to get portrayed as a bunch of promiscuous heathens that would ultimately corrupt a child. But I don't think I've ever seen a gay couple act any worse than a straight couple.
I support it, and not just because I'm relevant to it (again, I don't want children myself). It's a shame desperate kids are missing out on perfectly good homes and being cycled through the already overcrowded system.
But realistically, it may be more prudent and responsible to wait until gay marriage (or at least civil unions) become the norm before allowing gay adoptions. Just so people will get used to the idea, and the teasing element may be significantly lessened. For example, gay people get picked on a lot less in general now than they did back in the day, and that's mostly attributed to people getting used to it.
