Pisces and Sagittarius together?

I often hear that the Pisces/Sagittarius combo is a terrible match. I'd love to hear some sag inputs.
How would we go together?

Me: Pisces sun/mercury, leo moon, libra rising, aqua venus, cap mars.
Him: Sagittarius sun, cancer moon, cap mercury, aqua venus, scorpio mars.

I don't know his exact time of birth, but I think his rising sign is either water or earth since he's such a calm person. He's shy around strangers and kind of quiet, unless he's in "play mode."

My dad is a Pisces, and we don't get along well half the time, the other half we do. I have a few pisces friends, although it is a lot of work for me to be to them what they would consider a good friend. Although, one of my good friends is a pisces, and while we are very different, we get along very well. I think its one of those things you'd have to feel out. I can tell you they are very sensitive, and can't take criticism well. Since we tend to be very...real, people can't always handle it. Pisces is probably the worst at it. You might get tired of it after a while, trying to cover up who you are. But everyone is different. You can't always make blanket statements about what will work and what won't. If you feel a connection, you should definitely see where it goes. And definitely report back.