Well, Gerry's post reminds me a little of how legal academics have dismissed the political science literature. By dismissing empirical findings based on anecdotal stories (lawprofs not reading things they cite). Especially since the non-reading should be constant over time, so that relative comparisons over time (or between polisci and legal sources) would not be biased by this. But I would concede the overarching point that the improvement is incomplete and also that a citation does not necessarily imply real comprehension.
The more important question is how to continue to advance the ball. Here's one possibility. Bernie Black wants to add a political science series to SSRN. He wants to do all political science, not just the judicial aspects, and this is beyond my ken, I fear. If any political scientists are reading this and would like to contribute to designing this series, please contact me (or him directly). SSRN is a very valuable addition to research distribution and widely read by law professors, who I'm sure would subscribe to (or search) a political science series.