The plugin adds the rating widget from http://www.rateit.org.uk to your blog
<h3>Arbitrary section</h3>
You may provide arbitrary sections, in the same format as the ones above. This may be of use for extremely complicated 
plugins where more information needs to be conveyed that doesn’t fit into the categories of “description” or 
“installation.” Arbitrary sections will be shown below the built-in sections outlined above.
<h3>A brief Markdown Example</h3>
Ordered list:
<ol>
<li>Some feature</li>
<li>Another feature</li>
<li>Something else about the plugin</li>
</ol>
Unordered list:
<ul>
<li>something</li>
<li>something else</li>
<li>third thing</li>
</ul>
Here’s a link to <a href="https://wordpress.org/" title="Your favorite software" rel="ugc">WordPress</a> and one to <a href="http://daringfireball.net/projects/markdown/syntax" title="Markdown is what the parser uses to process much of the readme file" rel="nofollow ugc">Markdown’s Syntax Documentation</a>. 
Titles are optional, naturally.
Markdown uses email style notation for blockquotes and I’ve been told:
<blockquote>
Asterisks for emphasis. Double it up for strong.
</blockquote>
<pre><code><?php code(); // goes in backticks ?>
</code></pre>

RateIt

pixelgrade

vlad.olaru

George Olaru

Andrei Lupu

raduconstantin

Easily add a rating system to your comments area and start displaying reviews from your visitors.

Comments Ratings

ただ、平均値表示などの機能がないため、その点で不便に感じました。
欲を言うならば、Comment Star Rating（Matometaru）のように、post metaにデータが登録されて、細かい表示がされるとより良いと感じました。

However, I felt inconvenient at that point because there was no function such as average display.
If you say greed, like Comment Star Rating (Matometaru), I felt that it would be better if data were registered in post meta and detailed display was done.

軽量で良いプラグインです（ Lightweight and good plugin）

Convert comments into reviews for your visitors.

RateIt vs Comments Ratings