Fuck the Non-Human path too, it's a pain in the ass and the best characters are like half as good as the A-listers in the Human path.
What she said... the non-human are soooooooooooooooooo bad. They are really really really awful.
I seriously recommend going Human Path first and then Non-human for a New Game+ (Jack will be stronger, so that'll help)
The best hero on the non-human side is like average at best when compared to the humans.
One thing I love about that game though is the melancholy. No matter which path you choose, you can't save everyone/everything.
This brings a lot of weight to the path you decide.