Google has been criticized for not being very open or interacting with the web community as much as they could, but that might be changing this year. Google Blog Team member Karen Wickre says that it is unlikely that it will happen soon, but that she hopes to enable the comments feature on the official Google blog sometime this year.
The reason Google hasn't already done this, says Wickre, is that "It's a resource issue. It has nothing to do with reluctance to post criticism. We have a very small team and it's hard to gauge what the volume of comments might be; we're a lot bigger target than other sites."