How does Fedora Project ensure the quality of the packages in EPEL?
Packages are peer reviewed against extensive packaging guidelines before being imported into the repository. Only updates that fix important bugs get pushed to the stable repository directly. Other updates hit a testing repository first and get released as an EPEL scheduled update in parallel with the EL scheduled updates. Packages often are tested in Fedora, too. The Fedora Packaging Guidelines and QA team back up all these efforts, helping to avoid errors. There are also discussions for more strict QA policies. Do participate and help us.