[molbioguy]

There are definitely things that skew the index that might not necessarily reflect the quality of the journal. For example, the 20th ranked journal by H-5 index is Nucleic Acids Research (NAR). However, when you look at the H-index articles for NAR, you see that they are dominated by articles announcing or simply cataloging an important database. These get cited very extensively, becuase anytime you use a database you need to cite it, but they aren't what I would call high impact research articles. NAR just happens to be a journal that has a special annual Database issue where bioinformaticists can drop an article describing their useful database.

EDIT: It would be fair to say that since a database is so widely cited it is important. So maybe the index is more robust than I originally considered. But something still seems skewed here.