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OTOH, if I had a rapid fire assault weapon, aim wouldn't really be as big an issue as it would be with a glock.

Aim is ALWAYS an issue. Whatever bullets don't hit the bad guy are going to keep going past him, until they hit something that stops them. Hopefully, something OTHER than the baby crib across the street.

Bullets (especially rifle bullets) will penetrate interior walls (sheetrock will be penetrated by a forcefully pushed pencil), the vinyl siding on the house's exterior, the vinyl siding on the house across the street (you get the picture)

"Bullets (especially rifle bullets) will penetrate interior walls (sheetrock will be penetrated by a forcefully pushed pencil), the vinyl siding on the house's exterior, the vinyl siding on the house across the street (you get the picture)"

Good point. However, most people are surprised to learn that the bullet from an ordinary AR15/M16 (a .223 Rem or 5.56mm NATO) will have LESS overpenetration in building materials (or glass, or car door panels) than will an ordinary 9mm pistol bullet. The 223 will be more likely to penetrate a protective vest, but may be an excellent choice for home defense. (A 30 caliber such as a .308 Win is NOT such a good choice!)

Of course, anyone who lives in an apartment or has family members scattered throughout the house should buy the expensive frangible ammo (or birdshot in a shotgun) to avoid injuring untargeted others.