Whats up with this wordpress comment error

this error is so damn frustrating.. i get the majority of my backlinks from comments posting. Wordpress is exceptionally annoying in this matter.

I read the post, write a relevant comment and when i press submit i get this in the URL bar:

http://anydomainname.com/wp-comments-post.php

Click to expand...

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This happens on 6 out of 10 wordpress blogs i visit.

does anyone why why thsi sad error happens?

it's a loop hole you can get this easy to avoid spam comment's editing the core files of wp

no, i dont want this.. im tired of seeing this message.

Im not spamming.. I try to write legit and valid comments.. so does this function even keep away the valid commenters?