So based on some of the replies, it sounds to me that semi autos are mostly suited for home defense although with home defense you would be best off with a shotgun either pump or semi doesn't matter and a handgun for backup and for situations where a handgun would be better than a long gun. With rifles, there is the problem of over penetration so the rifle is mainly a hunting weapon.
Also Im under the impression that the bolt action is more rugged, more durable, and is simpler in its function than a semi auto.
Eh, I don't know about that. It depends on your individual situation. Certainly a rifle might not be ideal due to over penetration and the potential danger to others both in and outside the home but I know lots of people that keep an AR loaded for home defense.
A bolt action is definitely simpler in function and for the most part, will be lighter but don't forget the semi-autos we're talking about here were designed for the battle field and can likely take just about any abuse we could give them while hunting.
The real issue is power to weight ratio. My AR-10 .308 weighs close to 10 pounds fully loaded while any bolt action in the same caliber is not much more than half that. I have to go 1100 feet in elevation in about half a mile to get from camp to my stand. There's no way I would want to lug a 10 pound rifle on that hike. That's why I prefer short, light lever actions for hunting at home where I have to do some walking around.
It's really all about personal preference and what works best for you where you hunt. I'm the only lever action guy in my camp. Most guys hunt with bolts but there are a few other action types.