A dictionary defines love as a "warm affection" where affection is defined as love, in which case and first of all, love is not very definable in professional terms. Although, each person may define love differently, it is presumed by most as a strong feeling for and desire to be with someone for our whole life. It is care for that special person and wish for him or her to be happy, but also hope for a mutual love. Thus if to think of it, love is a feeling built on knowledge of that special person, yet love at first sight is a feeling of mere lust because otherwise, how would it be possible to care for that someone and to want him or her to be happy if there's nothing to base our feelings on except the general appearance.
If to actually imagine love at first sight as something possible in real life, the relationship will still have many complications, if there is going to be any relationship at all. Suppose that there are two people in this possible relationship: Natalie and Ben. Ben sees Natalie at the party or club or any other social place and instantly falls in love with her, whereas Natalie may not even like Ben. That's one reason why this as any other relationship will have not worked. There isn't anything special about being in love, except the fact that Ben will have to cry more because of such a terrible love match; otherwise, love isn't going to bring those two people together. However, Suppose Ben will have Natalie's affection and suppose they actually get to talk to each other. Even in this case, it may not work out: Ben will meet Natalie and will start talking to her and during their conversation