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Unless you really, really want word verification set up on your blog, please check it's not there by default and remove if it is.
Advantages to the blogger of having it set up - can reduce the chances of you getting spam comments. If that's why you have it, consider moderating comments instead as that ensures nothing gets posted without your approval.
Advantages to blog reader - none
Disadvantages to blogger - discourages people from commenting on your blog. Makes the blog seem less friendly. Annoys your blog followers.
Disadvantages to blog reader - often takes longer to verify a comment than make it. Very frustrating.
Comments
I almost - but not quite - gave up, but there have been other times when I've said, "Oh sod it!" and exited stage left.