It's very rare that I see a website using custom fonts that are actually easy to read. They bloat pages, are non-standard, can be hard on the eyes. Sometimes it's so bad I go into Chrome's developer view and just disable them entirely so everything defaults to Black Arial 14px.
My user agent styles include covering almost everything with font-family: Ubuntu !important. I did it as an experiment, but very rapidly decided I was never going back on a long-term basis (I've switched back once and couldn't bear it after a day or so).
Valid point. I find most designers are using custom fonts that are too thin to be readable. They look clean but not readable. But Arial is not a readable font either. Next time try defaulting to Verdana.
