Gana compatibility has only a weightage of 1% in horoscope matching. There are many other things to check for a proper evaluation of horoscope matching. If you want a good compatibility check, you can read my blog navagrahastro.blogspot.in
For your information my wife is one with a Rakshasa Gana and I belong to Manushya Gana and we are shortly celebrating Golden Jubilee of our very happy marriage. See how foolish it is to deny marriage on account of Gana mismatch alone.