The seven aspects of user experience, as defined by the User Experience Honeycomb by Peter Morville, are:
Useful: Content should fulfill a need.
Usable: The site must be easy to use.
Desirable: Images, identity, brand, etc., should evoke emotion and appreciation.
Findable: Content needs to be navigable and locatable onsite and offsite.
Accessible: Content needs to be accessible to people with disabilities.
Credible: Users must trust and believe what you tell them.
Valuable: The site must deliver value to the user.