My hair do naturally do a side part because I got a lots of swirls/cowlicks in my hair. I have tried doing other styles but I don't bother any more because it's to much work (and I don't like using products in my hair).
I also do a side part or off centered part. I tried doing a middle part when I had long extensions but I find it really annoying because my hair gets in my face easier. I have tried doing the part on the other side as well but it looks so strange I always go back to my usual way.
I think that people who doesn’t like to care for their hair, should not do the middle part. It can make it look like it just fell that way and you don’t care (which you don’t). If, however, you don’t do much with your hair, you part it anywhere other than the middle, it will look less careless and more interesting. I think, I think. 🙂