It's been a while since I delved into the nuances of Marlins versus Remlins. What I do recall is the most suspect guns were 2009 or so, serial numbers starting with 91.
Regardless, I've seen both good and bad examples from that time period. In fact I've had a few of both, but, I've gotten over the bad ones and have no hard feelings.
Fast forward to today, the new ones I've seen in the stores seem to be very nice guns. That is to say, none of a crazy issues like canted front sights, or the more benign stock fitment cosmetics, appear to be a thing of the past.
I was in a gun store recently when a deputy sheriff came in to pickup a 45/70 SBL he'd ordered and, despite me owning one already, I was green with envy when he walked out, it was a very fine lever action rifle.
Keep your eyes open for sure, but from what I can tell, Marlin is back on track.
Edit: may as well add a picture of my two favorites; a 2002 guide gun converted to pistol grip and big loop lever and a 2006 Trapper, .357 also converted to big loop.