>fonts can help readability

Yes, this is true. But it seems that many custom fonts are not designed for being rendered in a browser.

Recently, I have seen pages using fonts which look blurred, fuzzy or have a weird shape. These fonts are used for the main content (copy text). There must be people who notice that this is hard to read, but nobody seems to say anything. Some days ago I was told that "it looks expensive".

I am also affected by occasional browser and OS freezing due to webfonts. The freezing may last for an eternity (subjective) and is accompanied by an intense feeling that I have lost control. A user experience can't be worse.