I fully agree with you here Phil. Just because the 15-22 looks bad ass doesn't make it an acceptable self defense weapon. Sure, it'd probably work in a pinch but not something I would want to rely on if the shtf. So it's really unfair to try and hold a rimfire rifle (any rimfire firearm for that matter, especially semi-autos) to the standards of a more dedicated self defense platform.
There's simply too much variance in the ammo as well as it's ability to cycle the action if it's not a consistent load and is on the low end with powder. That added to the tendency for failure to fires, even with good primer strikes, makes it less than ideal for a dedicated self defense role. (not to mention the argument of stopping power and penetration)
With that said... .22 is still one of my favorite platforms to shoot. Just not something I'd consider a go-to gun for self defense.