To each his own. I bought one of the early Ruger Americans chambered for 300 Blackout. From the start, not having a suppressor, I loaded 125 grain Nosler Ballistic Tips. Accuracy was good, and terminal results on pigs and whitetails were very good. Recoil was very slight. Great cartridge for women and children. Subsonic rounds were not my focus at the time, but the cartridge was a powder miser, brass was everywhere, and it was easy to load for. I guess I am just the opposite of the naysayers.
I like the round, personally, and the house AR is so chambered. You can run 125's up to 2400 fps, which turns it into an M1 carbine on steroids - Same magazines as the 5.56, and the same bolt too, it you are building a gun.
I'm pretty unimpressed with the subsonic Matchkings on game. I have heard good things about the LeHigh defense bullets, however.