The likeability factor

Someone triggered a thought chain in my mind yesterday.
"I like every girl that I come across."

Is that true?
What does it take for me to say "I like this girl, she seems interesting" :
Honestly thinking - a cute hello, an infectious smile and the way she carries herself in a group.

So that means she doesnt even have to talk to me for me to believe that shes interesting and I like her.
I wonder what it is for others? What does it take for you to believe someone (a guy/girl) is interesting?

To be brutally honest and I know most of who know me wont accept this - I take the same parametric scale when I form an opinion on guys as well.
But it is always my leanings toward the fairer sex that gets all the news. Sometimes I feel sick, but that is the price you give to be at the center many a time.

I go back to my good old days ( after all, old days are always good when u think retrospectively) - I have a few girls whom I can talk for hours because I have a special liking for their tastes and their ideas/decision-making, there have been some girls whom I wanted to talk with extensively but never got so far, and there are still few with whom I would like to get acquainted better.

And finally - yeah, I never have said, "I dont like this girl".
And I dont think I am going to change that standpoint yet.