I'm sorry, but this is wrong.
First of all, what do you mean by rapid-fire? One squeeze = one shot. I repeat this over and over because it matters.
Second, most of the guns that are manufactured now (and used for hunting, sports shooting, home invasion) are sem-automatic. VERY few are not. Semantics matter.
Sports shooting: I use mine for this. Many of my friends and family do as well. As a matter of fact, most people that have an AR-15 or AK-47 use them for this purpose. The AR-15 is the most popular platform of rifle for a reason.
Hunting: Plenty of people use an AR for hunting. They are very common for hunting wild boar in Arkansas, for example, and small game. Most people do not use them for deer or larger game. You know why? The caliber of the 5.56/223 is not large enough (often considered a varmint caliber)
calibers.jpg
Home Defense: A shotgun is probably best for this, but any gun is better than none.