http://bugs.winehq.org/show_bug.cgi?id=31774
--- Comment #17 from Philby John philbyjohn@yahoo.com --- There are multiple users having the same issue. One such user posted a link on how to solve the rendering problem here https://bbs.archlinux.org/viewtopic.php?id=134977
So, essentially what they did was to enable Infinality Font Rendering. After that the fonts look swell. For the record, one can follow the instructions here.
http://www.infinality.net/forum/viewtopic.php?f=2&t=77