It is no secret that if there are lots of
Broken Links (404 errors) and
Thin Content on your website, it hurts your website ranking in
Google. If you are serious about
search engine traffic then often you need to remove
unwanted URLs from
Google's Index.
Even if I did not care about
search engine traffic in particular, still I would want to have only quality pages live on my website. I prefer everything I own to be neat and clean.
Let's back to the topic, no matter how careful you are while building your website or publishing content, you get some of those ugly pages and URLs.