Maybe safe-of-the-art. It is stable (and old) which is the way many people like their servers. But, it certainly isn't the latest and greatest.
The entire point of RHEL/CentOS is that it isn't bleeding edge; it will certainly be modern though. I think it's rather unfair to call it "old" though; the latest release was in March.
Fair enough. But the mentality that picks stable over up-to-date tends to never upgrade. I'm stuck supporting rhel5.5, our "new" systems are 6.5
If you are hosting gameservers, it just does not fit.