I think the Remlin era where mechanically excellent guns made on modern machining equipment, but a lot of them had poorly fitted wood, canted sights, and sharp edges on stuff like the lever.
Much of the production during the Remlin era wouldn't fit this description. As an example, my wife had wanted an 1895 SBL for quite some time, and being whimsical fans of dinosaurs as we are, when the Jurassic World movie came out, showcasing that very rifle, the last shoe dropped. The first one we received matched your description - just poorly selected laminate wood components, the forend was loose enough to rattle and the color of the two pieces just didn't match (buttstock pale grey, the forend nearly black), but the distributor and retailer were gracious when we rejected delivery, and they replaced it. The second arrived non-functioning - the bolt literally could not be closed fully into battery. The receiver was rough milled internally with hundreds of ridges deep enough to hang a fingernail. Obviously and mutually frustrated at that point, the retailer let me swap the forend from the second onto the first, and sent the second unit back, and we left relatively happy, after wasting a few trips into town over a couple of weeks, for what ultimately should have been one trip after Second Day shipping. It wasn't as slick out of the box as her JM 1895 GS Guide Gun, but it also wasn't going to be fired without being reworked anyway. I wouldn't give the majority of the REP or barcoded Remlins I have seen a grade of "mechanically excellent". "Operable" is probably apt for a majority of that era, but I certainly wouldn't go so far as to say "mechanically excellent" about any Remlin I've seen.
Modern machining equipment can do amazing things, but not if the Quality Program doesn't ensure no parts miss any production steps, and not if the labor force aren't properly trained to ensure fit and function of the parts they're putting together. If we just allow parts to be put together and the only defect mode is "they don't fit together," we still end up with functional and aesthetic defects, even using quarter million dollar machines in between.
That said, the JM era was a long, LONG time, and it wasn't without eras of poor production reputation, and wasn't without its share of random lemons either. I've worked on a lot of JM guns with "two tone" forends and buttstocks, some almost blonde and some deep red, and I have a JM 1894SS 44mag which has the tail of the bolt hanging about 1/16" out of the back of the receiver when it's closed into battery - really not certain how that can happen - but it runs ok, despite obviously poor fitwork. And of course, the "Marlin Jam" wasn't a Remlin innovation. I'm also certain there are threads out on the internet already which describe functional and aesthetic flaws occurring in Ruger manufactured Ruglins. But the Remlin era was rough, for a long time and a lot of guns...