Really, more than likely it was just luck of the draw. Some of them were new, some were used. I'll qualify it a bit by saying that most of the issues occurred years ago, before Remington was bought by Cerberus, back during the bad financial years.
What really ruined me on Remington was the CRAP I went through with an LTR I had that was just a dog of a rifle, and it was brand spanking new. It wouldn't shoot anything, factory or handloads. I'm friends with a couple of SWAT guys, two of whom are sniper/counter sniper trained. They couldn't get the thing to group either. I sent it back with a letter, talked to a guy on the phone a couple of times....they said that they barrel was bad. Ok. They'd replace it for me......at substantial cost on my part (I could have bought a new Shilen barrel for what they wanted to charge me). I'd had the gun less than two weeks, still had the box, receipt, etc. Sorry, I wasn't paying for anything. They took several weeks getting it back to me, I had a smith take it apart and I sold the parts and regained a lot of my money.
I love their innovations and looks of the guns, really, I think the only bolt actions that compare to the looks of a 700 are a classic Model 70 or a good custom Mauser. They got a ton of rifles that I'd love to own, but I have no confidence at all that they'd stand behind them if there was an issue.
With Ruger, I've yet to have any issues that I need to address with the factory.