Yes it does. If someone met your unconscious criteria the same moment you saw him then most probably you will fall in love with him.
You might be asking yourself, how can I know that he meets my criteria while i never talked to him before? The answer is simple, the criteria might involve items like the way he walks, talks or looks at you either because they have some connection to your past or either because they remind you of someone you loved before (people usually fall in love with those similar to the ones they loved before).
If your criteria depends heavily on looks then your chance of falling in love at the first sight will be much higher than that of a person who gives higher priority to the personality or other qualities.