Neg.
Nice guys will always bend over the other way for someone they like. That way the person they like gets used to having what they want, soon coming expect to give little in return. Eventually they'll get sick of this and look for someone who has more self confidence, more self respect, someone who looks after themselves over others.
With me, it was simply being with a girl I saw as being way out of my league, I got so excited by the fact she was interested in me that I did pretty much anything for her- I essentially changed from the person I was, the person she liked, into this huge nice guy, with open feelings etc. (fuck I was gay). In hindsight it was pretty pathetic toadying, I really can't see how any girl would find that attractive. I've also always see great girls be mindlessly attracted to giant dick heads, many who aren't even attractive and don't have an iota of personality. It doesn't make sense, but from what I've seen, if you want to get anywhere with most girls you've got to think more about yourself.