Look at this post for example - the C# examples are highlighted very well, but the Java ones are poor. I'm using the latest version of WP-Syntax
BTW, does this belong on UserVoice or here? I couldn't quite decide.
I checked the CSS and it seems that all styles are inlined. So I think that the Java config of WP-Syntax is using these ugly defaults. If WP-Syntax was using CSS classes for the highlight, it would be simple to fix.