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While I do agree that RHEL 6 is long over-due. (Especially if you use it as a workstation), in RedHat's defense, a lot of resources were invested in making 5.3 and 5.4 more competitive with recent distributions - anything from new(er) Firefox, evolution to backported network stack changes, updated drivers and KVM support.
Hopefully RHEL is right around the corner. (And with it, more blood into the EPEL project)