If you installed the latest rpm's from the infinality website, then you also need the configuration files to enable the changes. Did you do this, or just installed the rpm's and expected magik to happen?
Otherwise, if you don't like those results, then prepare to compile your own version of some packages with various ubuntu patches applied. Search around for the big ubuntu font thread for where to start along with some sample config files.
You also have to make sure that you are using fonts that support hinting and aliasing. Many free ones
simply do not, or not well.
Lastly, there are already at least a couple lengthy threads on this, so why did you feel the need to start yet another?