Nobody, sometimes, you need to see someone else to realize what it is you like/don’t like about the other person. Chances are, you are comparing your dates whether you realize it or not. After all, you are thinking about the last person you rejected because of XYZ middah and trying to see if this person is better. This is in addition to seeing if you like the person and are compatible.
Its not a matter of rejecting a person because the other was better in comparison – its a matter of choosing the person that is right FOR YOU. When you are dating, you sort of have to be selfish and say “What is best for me? What do I want out of the person I am dating?” Granted, this is early on before emotions really come into play. But no one is talking about dating multiple people for long spans of time.