Humanity
The majority of vampires default to Humanity. Even the depraved vampires of the Sabbat and the jaded elders of the Camarilla cling to some vestige of Humanity, though such monsters usually have very few Humanity Traits. The ethics of Humanity uphold what constitutes humane behavior: Humanity warns against stealing, killing, harming others or behaving selfishly.
Humanity Five - Kindred with a score this high can be, ironically, more human than other humans. Many fledgling vampires cling to their moral codes more strictly as a reaction against the new predator roiling in them. Though not necessarily treacly sweet or passive, these Kindred have excruciatingly high standards for themselves and often hold clearly defined concepts of right and wrong.
Humanity Four-Theft is wrong. Murder or harming others is wrong. But sometimes the speed limit is just too damn slow. Vampires at this level are approximate to "normal" social morals, and are on par with most of mortal society. The vampire is concerned with the natural rights of others, but there's some natural selfishness mixed in.
Humanity Three - People die. Stuff breaks. This vampire has little difficulty with the fact that she is a predator. While she won't always go out of her way to vandalize or kill, she accepts that sometimes fate has it in for some people. She does what needs doing with little griping or effort on her part to avoid it. Something of the vampire's inner monster starts to shine through at this stage, causing mortals to feel uncomfortable around her or manifesting some physical eeriness.
Humanity Two - Hey, some people ought to die. Killing is very acceptable to this Kindred, provided the victim deserves to die (and only the vampire knows who's deserving). Theft, injury, torture and destruction are tools to be used to accomplish one's goals, and one's goals are always paramount. Such a state reflects many vampire elders. The vampire begins to acquire a corpselike aspect, and may find it difficult to interact with mortals (who often find him more than a little disturbing).
Humanity One -The lives and property of others mean nothing to a Kindred this far gone. Such a vampire more than likely indulges in twisted pleasures, which can be all manner of atrocity. Perversion, cold-blooded murder, mutilation, wickedness for its own sake are all signs of a Kindred who has not long to continue. The next frenzy may well he the last. Such a vampire may be physically mistaken for human, but only under certain conditions (such as dim lighting and plenty of distractions).