Just upgraded to Google Chrome Beta (6.xx) and then to Unstable (7.xx) in my Fedora box and noticed the butt-ugly font rendering in both versions. Apparently it's a known issue with gtk-webkit, but I would have expected Google to fix something as elementary and important as font rendering before concentrating on anything else.
A bit of Googling (ofcourse!) dug up this excellent post that fixed the font rendering issue in seconds!
Compare the before and after shots to see how severe the issue is: