I have a compact in 223, a standard rifle in 308. The factory 223 mag wouldn't feed the last round, but Ruger replaced it and the replacement functions 100%. I've since read that simply using a file to remove a tiny bit of material from the sides of the mag will fix the problem. The 308 functioned perfectly from the start.
The 223 shoots .75-1 MOA pretty consistently with quality ammo. About double that with cheap FMJ. The 308 so far isn't quite as accurate, but perfectly acceptable for what it is. Just over 1 MOA.
You will find a lot of guys replacing the stock or doing all sorts of tricks to stiffen the stock. All a waste of time and money IMHO. As long as the stock never contacts the barrel it doesn't matter how "floppy" it is. I simply used a file and dremmel to give both of mine a generous free float. No problems, no expense.
The Ruger is a $350 rifle that shoots as well as most anything. I've seen guys replace so many parts they have $700 in it. While it is a decent gun, If I have $700, or even $500 to spend there are much better options. Part of the appeal is that it is a cheap gun that I don't worry about getting dinged up, or even lost/stolen. Start throwing money at it and that changes.
So far they seem to be doing OK, but I'd not want to use one on a hunting trip that involved long distance travel or great expense until a little more proven. For local, informal hunting yes. On a hunt that cost me money I'd want something more proven, at least for now. That may change.
If it had been available when I purchased mine I'd have gone with the Predator in 308. It is the same 18" barrel, but with a standard length stock and a slightly heavier barrel that is threaded for a suppressor. Not that much more expensive.