Long time coming.
And it's only the message boards. Not the IMDB itself because they're useful.
On the contrary however, the fundamental beauty of IMDB's message boards is the ability of readers to narrow down their focus on a vast range of topics. To put things into proper perspective, where else can one go for a contemporary POV on an obscure, 50 year old movie?
While there are good blogs, like AV Club, which try to cover the same breadth of subject matter in a thoughtful manner, discussion is focused on whatever the paid staff wants to discuss.