Re: most "wrong" episode...
All I know, is that the five Xindi races didn't seem to have any issues evolving alongside each other.
That's debatable. They were at war with each other. A war that resulted in the destruction of their homeworld and extinction of the sixth Xindi species.
"Internet message boards aren't as funny today as they were ten years ago. I've stopped reading new posts." -The Simpsons 20th anniversary special.