Kudos to the team for including akismet. On the subject blog, I've had:
3,600 valid comments
30,600 spam comments
I can count on two hands the number of type 1 errors (spam missed) and type 2 errors (valid comments tagged as spam).
This 0.03% error rate is excellent performance. I could not maintain any semblance of a usable blog without it.
The blog I need help with is scammerdatabase.wordpress.com.