Marlin ruined Marlin in the first place that's why they fell into the hands of Remington who did them no favors. Ruger has had QC issues of their own in the past but they have always righted their problems and they have always remained a solid company with very good customer service. I wouldn't have any problem trying out a Ruger made Marlin in .357 or .44 mag when they hit the shelves.
I agree with this. As for the calibers mentioned, one can only hope that Ruger would produce a product that didn't have the problems which many Marlin pistol-caliber lever guns were prone to. I had two, one in 44 mag and another in 357. The 357 worked like it should, the 44 never did, and eventually I sold it at a loss- because I was honest about it's problems.
Ruger has always struck me as a decent quality maker, though I admit my own experience with their products has been mostly limited to handguns. Then again Remington WAS a quality manufacturer at on time. So, I don't know how Ruger quality may or may not have fluctuated in the same way.