I can't speak to the kerning (it looks fine to me, I guess I'm not a font nerd) but in those screenshots, the user has selected monochrome subpixel rendering an

I can't speak to the kerning (it looks fine to me, I guess I'm not a font nerd) but in those screenshots, the user has selected monochrome subpixel rendering and either no or very light hinting. These together make the text a bit more blurry than it does on my own machine. And of course, it's also possible that using a better font would improve things.