From what I understand from people that know, much of the tooling that Marlin had was pretty much shot and Remington had to start from scratch using OLD plans and specs. A lot of the Marlins were made by people who just made parts as they went along, nothing wrong with that except if someone has to follow you, like Remington.
The new ones I have looked at are much better built than some just a few years ago. This not to say that the new ones are better than Marlins of say 10-15 years ago, but the new ones have a solid feel to them that some of more recent ones lacked. Just my opnion and ask my wife what that is really worth-----LOL