Blurry fonts was my main issue with WPF. I get headaches from blurry text and the colour bleeding from ClearType just makes the headache worse.

Fortunately for me, I had mostly switched to Linux by that time already, where it was at the time relatively easy to just enable grey scale AA with full hinting.

In recent years this has gotten worse again with modern software incorrectly assuming everyone has a High DPI monitor. My trick has been to use bitmap fonts with no AA, but that broke in recent versions of electron, where bitmap fonts are now rendered blurry. So I had to stay on an old version of vscode from last year, and I will be looking to switch to another editor (high time anyway for other reasons).

WPF originally had two major rendering issues. One was the lack of pixel snapping support, and another was gamma correction issues during text rendering, particularly for light text on a dark background (due to an alpha correction approximation, IIRC). The two combined led to blurry text in WPF applications.

These were finally improved for WPF 4, since Visual Studio 2010 switched to it and had a near riot in the betas due to the poor rendering in the text editor.