[KevinSartori]

I'm an Emby user and for Rotten Tomatoes, Emby uses the <criticrating> tag.  Will you be supporting that tag for RT ratings on Emby?

Is there any page on the Emby wiki that shows how the ratings has to be named? Is <criticrating> a node inside the root or <ratings> node? Actually only the Kodi <ratings> container with the names you can see on the screenshot are supported.

I couldn't find an Emby wiki for that, so I thought it might be easier to show you an .nfo file exported by Emby: 

<?xml version="1.0" encoding="utf-8" standalone="yes"?>
<movie>
  <plot><![CDATA[A teenage girl fights to protect the last working well in a drought-stricken valley from a greedy water baron.]]></plot>
  <outline><![CDATA[Stand your ground.]]></outline>
  <lockdata>false</lockdata>
  <dateadded>2018-04-01 18:06:40</dateadded>
  <title>The Last Survivors</title>
  <originaltitle>The Well</originaltitle>
  <actor>
    <name>Haley Lu Richardson</name>
    <type>Actor</type>
    <tmdbid>1286328</tmdbid>
    <imdbid>nm4726634</imdbid>
  </actor>
  <actor>
    <name>Booboo Stewart</name>
    <type>Actor</type>
    <tmdbid>121868</tmdbid>
    <imdbid>nm1559927</imdbid>
  </actor>
  <actor>
    <name>Max Charles</name>
    <type>Actor</type>
    <tmdbid>558928</tmdbid>
    <imdbid>nm1934618</imdbid>
  </actor>
  <actor>
    <name>Nicole Arianna Fox</name>
    <type>Actor</type>
  </actor>
  <director>Tom Hammock</director>
  <writer>Jacob Forman</writer>
  <writer>Tom Hammock</writer>
  <credits>Jacob Forman</credits>
  <credits>Tom Hammock</credits>
  <trailer>plugin://plugin.video.youtube/?action=play_video&amp;videoid=l9IVgbxOdpo</trailer>
  <rating>5.3</rating>
  <year>2014</year>
  <mpaa>Not Rated</mpaa>
  <imdbid>tt2558318</imdbid>
  <tmdbid>270771</tmdbid>
  <language>en-US</language>
  <premiered>2014-06-12</premiered>
  <releasedate>2014-06-12</releasedate>
  <criticrating>75</criticrating>
  <runtime>95</runtime>
  <tagline>Stand your ground.</tagline>
  <country>United States of America</country>
  <genre>Action</genre>
  <genre>Thriller</genre>
  <studio>Federighi Films</studio>
  <uniqueid type="Imdb">tt2558318</uniqueid>
  <uniqueid type="Tmdb">270771</uniqueid>
  <id>tt2558318</id>
  <fileinfo>
    <streamdetails>
      <video>
        <codec>h264</codec>
        <micodec>h264</micodec>
        <bitrate>13024224</bitrate>
        <width>1920</width>
        <height>800</height>
        <aspect>2.40:1</aspect>
        <aspectratio>2.40:1</aspectratio>
        <framerate>23.976025</framerate>
        <language>eng</language>
        <scantype>progressive</scantype>
        <default>False</default>
        <forced>False</forced>
        <duration>94</duration>
        <durationinseconds>5696</durationinseconds>
      </video>
      <audio>
        <codec>dts</codec>
        <micodec>dts</micodec>
        <bitrate>1536000</bitrate>
        <language>eng</language>
        <scantype>progressive</scantype>
        <channels>6</channels>
        <samplingrate>48000</samplingrate>
        <default>True</default>
        <forced>False</forced>
      </audio>
      <subtitle>
        <codec>PGSSUB</codec>
        <micodec>PGSSUB</micodec>
        <language>eng</language>
        <scantype>progressive</scantype>
        <default>True</default>
        <forced>False</forced>
      </subtitle>
    </streamdetails>
  </fileinfo>
  <tmdb>270771</tmdb>
  <votes>3419</votes>
  <datemodified>2021-01-11 18:35:20</datemodified>
  <videosource>bluray</videosource>
  <locked>false</locked>
</movie>

Does that help?