The Mini isn't a target rifle nor a good choice for prairie dogs. But for hunting jackrabbits and coyotes, it's plenty good. I always put a Weaver K4 on my various Minis.
They are noted for reliability, so they're as good for self-defense as any other rifle using a .223 cartridge. I've never heard of any rifle of any sort which won't shoot into minute of torso at self-defense distances.
My Minis typically put the first couple of shots within an inch of where I intended to hit. Quite often a typical three-shot group was around 1.5 MOA. After that, the skinny barrel of an early model would "walk" a bit and the groups would open up. That's irrelevant to the needs of a hunter, and doesn't really matter in casual plinking.
You're from BATFE? Come right in! I use all your fine products!