Goes farther than the finish.
Wood to metal fit has been poor, I've seen large gaps filled in by what looked like bubblegum, and I've seen one that had a stock so loose it actually wobbled on a brand new gun.
Front sights have been canted, poorly cut front dovetails. Sloppy machining. Gritty actions. Reports of feeding failures.
I emphasize THIS IS NOT THE CASE IN ALL OF THEM.
There are acceptable examples out there, just make sure you check one out in person before laying down money.
Remington has put quite a bit of effort & money into upgrading the Marlin production process, and hopefully QC will become more consistent.