Oh man, I went a good while without playing RE2 OG, I need to bo back to doing that!
6 is ridiculous, 4 Remake is still sublime, Zero lost me when I forgot to save and knackered an hour of progress.
I enjoyed my time with 6 overall more than 5, but I don't think I'd replay them anytime soon, 5 can fuck off on solo at least. Zero is QUITE difficult/mean, the only other classic Resi as mean as Zero is Code Veronica, which feels like you can soft lock yourself in. How about that train section in Zero though eh?
Honestly, if you're playing classic Resi, REmake is the way to go, the snake cutscene still makes my jaw drop
Anyway RE2 Remake is my favourite game in the series, but it's much easier to replay the PS1 original on my RP Mini on the go, also I got the HD mod on the PC version MPH, you're a Graphics Enjoyer are you not, what do you think?
(Purists will kill me, but I've played this a million times I do not give a FUCK)

Even without the context of the cuts from Resident Evil 3 on PS1, I still think compared to RE2R, RE3R feels really rushed and on rails. Without THAT context and solely on its own, it's not a bad game, but I think it's fair to judge it as a remake still, it is presenting as one after all. I will say, you talk about replaying RE3, the PS1 version literally has different events and stuff depending on the way you go through it making different playthroughs feel fresh. (beating a dead horse with the RE3 OG vs Remake thing, but had to bring that up if we're talking replayability)
Though really, Resident Evil is timeless for a reason and I think you can feel it as you play the remakes
Capcom are essentially just a bunch of wizards right now, aren't they.
They've been on top form for a solid few years now and don't seem to be in danger of slowing down