You thought Atreyu was a girl? Or are you talking about Bastian?
To be fair though, I was six at the time and bad at recognizing facial features (the name didn't help either; Atreyu sounds like such a girl's name).
As for the third movie; the best way to describe it would be to imagine a highschool movie with the occasional bad special effecting at the end. Like almost none of the characters from the first two movies even bothered to show up.
Then again, even the second movie was weak (at least I figured out that Atreyu was a dude in that one), but at least it had SOME high fantasy adventure elements to it compared to 3.