A part of it is that I’ve not actually been watching a lot of bloggable anime, which is a distinct case from watching anime period. I watch quite a lot of Hidamari Sketch x365, for example, but I can’t find anything to say about it.
I noticed that too... I follow Hidamari, I read what TheBigN manages to commit to blog, and wonder just how he does that. A slightly different example is Gurren Lagann. The enormity of it is just overwhelming, but there's not much for me to blog that millions of monkeys haven't blogged before. Meanwhile, ef and Lucky Star are most blogged shows here (at 33 count), and they are nowhere near as great.