I understand that if I want ratings to round to the nearest .1 that I have to add more DataTriggers. Example --
<DataTrigger Binding="{Binding SelectedGame.CommunityStarRating}" Value="3" >
<Setter Property="Source" Value="pack://siteoforigin:,,,/Themes/Custom/Images/Theme/3.png" />
</DataTrigger>
<DataTrigger Binding="{Binding SelectedGame.CommunityStarRating}" Value="3.1" >
<Setter Property="Source" Value="pack://siteoforigin:,,,/Themes/Custom/Images/Theme/3.1.png" />
</DataTrigger>
<DataTrigger Binding="{Binding SelectedGame.CommunityStarRating}" Value="3.2" >
<Setter Property="Source" Value="pack://siteoforigin:,,,/Themes/Custom/Images/Theme/3.2.png" />
</DataTrigger>