336s were not made in Mayfield.
They were made in Ilion, NY.
In my opinion, current quality is better than right after the move to Ilion, but it is still substantially sub-par. Remington appears to have taken shortcuts with materials and heat-treating, and many rifles have major problems. (Some dangerous, in my opinion.)
Several stores in my area have stopped carrying Marlin firearms, at all, because of the quality control issues that have shown up in 336s and 1895s (new problems) in the last year to year and a half.
Hit the used racks, if you want a good Marlin.
If you don't like used rifles, and like to gamble, maybe you'll get lucky and end up with a half-decent Remlin.