WordPress is very good at filtering out spam comments. Their comment moderation system was part of the reason I switched. Every so often I run my eye over the spam section to check nothing has been misidentified – it doesn’t happen much, but every so often a genuine comment is marked as spam.
I do find some of the comments funny though – it’s the link to their website they want you to follow, of course, but sometimes the accompanying words make me grin.
“Thanks in support of sharing such a fastidious idea, post is fastidious, thats why i have read it fully”
Gosh, I do feel fastidious today.