1. One or more processor-accessible tangible media comprising processor-executable instructions for evaluating a ranking quality of a ranked list, wherein the processor-executable instructions, when executed, direct a system to perform acts comprising: accessing log data that reflects user interactions with a ranked list having multiple entries, the user interactions including at least indications of which of the multiple entries are selected entries and information from which dwell times for the selected entries may be derived; ascertaining which entries of the multiple entries of the ranked list are viewed entries; ascertaining which entries of the multiple entries of the ranked list are skipped entries, including fully skipped entries and partially skipped entries, based on the selected entries and the dwell times; and determining a ranking quality metric for the ranked list responsive to the skipped entries and the viewed entries.