The 300BLK is a unique cartridge as in it was designed for a specific purpose and in that it does well. As for a garden variety hunting cartridge, well, it will always cause derision. I own one chambered in the Ruger American Ranch rifle and love it. I initially bought the rifle on a whim, $465 for a new rifle - who wouldn't?
I had to wait about 7mths before the shipment came in but that was ok as I was in no rush.
I picked up a Millet 1.5-6x Marksmans scope and set of rings ready to fit. I also grabbed a few boxes of Outback 125gn SMK, 125gn Woodleigh factory to begin the testing and run in process. I also chased up dies, cases, projectiles in the 110-125gn weight range and Lil'Gun and Win296 powders.
When the rifle finally arrived, it was prepped and off to the range. The SMK factory loads proved to be the best, with groups of sub .5MOA @ 100M off the bench. The Woodies were also pretty good with an average of around .8MOA. My reloads were just under or just over MOA, so there is some work to be done in load development there.
I'm also looking to get the trigger down to around the 1.5-1.75Lb, which with the Ruger trigger system, will be easy and safe. Not to mention the benefit to accuracy potential.
The bolt is smooth straight out of the box but no doubt will smooth out even more with use.
The rifle comes to the shoulder well, is light, short and points well. Which suits what I planned for the rifle as I wanted something light to carry for close range work on small to medium game.
A lot of detractors will carry on about the negatives of the round and say it is only worth having if you can use it with a suppressor. That's fine, but ask them if they own one and use it often or just exactly what did they expect from it and under what situations & game targeted did they use the cartridge. Some folk's expectations are often way outside the realistic capabilities of the cartridge.
At the end of the day, the decision will boil down to just exactly what you want and what you expect from the rifle/cartridge. Only you will know the answer to this question and it is not unreasonable to say that even then, you may not fully know until such time as you've used said rifle/cartridge.
Weigh up your pros/cons, what you're wanting and want to use it for. Will you reload for it (best way to get the most from the cartridge), What restrictions do you have in where you're shooting/hunting, any financial restrictions etc.
The cartridge has a niche roll and should not be expected to be the one-gun/cartridge wonder. Used in the right situations, with the right load and against the right target, it will excel.
Otherwise, consider expanding your options..... good luck with you decision.