I think the Creedmoor is a great option for a newbie or someone replacing a short action cartridge like the .243.
It has certainly earned its stripes but I have no interest in it, because my rifles are centered around the standard action length. I like it, am used to it and do not want to stray from it.
My Cabela's SG in 7x57 is my shortest cartridge but still chambered in a standard action. Because it drives 140's to 2900fps, 120's to 3050fps and 175's to 2650fps, it covers all my needs in the lower 48. I recognize the attribute of the Creedmoor just as I recognized some attributes for some WSM's but have never nor ever, will own one.
John
