swing for the fences mate!

there is nothing really wrong with having a whole lot in common with someone, the only drawback i see is that if you're not into different things, you sometimes don't get to learn as much from that person. for instance i dated a girl one time who was a huge art fan, and because of that i know a fair amount of art related stuff. but i figure as long as you're willing to make an effort to do new things together, then i think you'll be fine.