Living by the numbers.
Quantitation of an article's worth by the impact of the journal in which it appears is a path to undermining scientific enterprise. Through a process analogous to rating medical care, rating journals can lead to loss of research effort in the most challenging questions. A paper should be evaluated on its own impact, not by some arbitrary score for the journal as a whole.
Yaffe
Michael B
MB
D010506:Periodicals as Topic / Q000592:standards*; D019984:Quality Indicators, Health Care / Q000592:standards*