Feelings? Nah- I don't even own a Creedmoor. I just find the constant crapping on it by some to usually be unfair or downright untrue in many cases. There was room for improvement in the space because it turns out there was actually a big market for people that want to shoot short action length cartridges that handle heavy for caliber, high BC bullets.
DeMille designed a cartridge, not a bullet- what you choose to stuff on the end is a different choice and there are plenty of good options for long, heavy for caliber bullets that are excellent for hunting (across many chamberings and diameters). A deer hit with a Muzzy launched from a Hoyt Stratos is just as dead as one launched from an RX-7.
The 156 is not what I would personally select either, but tons of guys find it perfectly acceptable to stuff a 180gr into a .3sl0w8 and get <2,600fps, so I don't have a major issue with it. At least the 156gr 6.5 has a BC that allows it to maintain more of that (already slow) velocity.