I thought 4 was too buggy compared to 3 and held off upgrading most machines until 5 was out. In retrospect that still seems like it was a good move even if most of the problems in 4 were eventually fixed in updates. But with many years elapsing between releases, skipping a version like that may not be possible again.
-- Les Mikesell
Les,
what was buggy for you?
internet facing or just internal servers?
centos and the centos team have been rock solid for us in dealing with CentOS 4 on our servers.
- rh