I still play, but I’ve always played brief stints and never gotten too deep. It feels really nicely fleshed out now. Tons of characters with interesting interactions, good maps, no awful microtransactions.
I will say though: It’s VERY hardcore. I guess that’s fine for Rainbow 6, but can be frustrating if you get matched up with people even a bit above your skill level. You’ll eat a headshot from someone perfectly hidden behind a single pixel because you slightly over-extended when you leaned left for a split second. Frustrating if you haven’t been playing since release and don’t know the maps extremely well.