Usability is in the details
“Although usability practitioners love to show examples of big usability issues with websites and applications, the vast majority of usability issues are typically in the details. By forcing your application users or website visitors to be constantly bothered with more detailed usability issues, you eventually wear down their patience and force them to decide whether to continue being annoyed, or to try a different application or website.” (W Craig Tomlin ~ Useful Usability)