It also irks me a bit that one of the guiding principles in Nate Silver's manifesto was that they would not chase the news, but would take their time to provide different insights than other outlets. Instead, it feels like they're constantly chasing the story of the day or yesterday.
Finally, a disappointing number of articles feel half-finished. As if one of their staff writers had an idea, ran with it for a while, then got tired and stopped at their first set of results. Sometimes I take that as a challenge and go scrounge up more data to try and pull together what else is going on, but most of the time I just end up not caring.
They still have a handful of lengthy and interesting pieces, but they're rare enough that I only check the site maybe once a week. Conversely, I check Grantland 10+ times a day, because their writers are engaging whether it's basketball stats or pop culture junk.