You do not see the thing itself, but the light that bounces off of it.
You cannot love a person you just met, people are too dynamic and complex, they change all the time.
The best you can do is love your perceived image of that person. No-one is perceptive enough to know someone at first glance.
You might get lucky, they might turn out to be someone you can truly love, but that's not your keen perception, it's luck.
Even when you've been with someone for years, they can surprise you, and turn out not to be the person you thought they were.
Love is still a worthwhile endeavor, but shoot for respect first, and let the love part build over time.
..also, pretty much everything Cyan said in the post above.