Splinter Cell games are the ones I replay trough each entries on a yearly basis or so for a long time, I gotta say Blacklist is really close to blend Chaos Theory with Conviction.
The gameplay is great in a sense that the game allow you to play it from one end of the spectrum (full stealth) to the other (all guns blazing) hence the two cited earlier, it also manages imo to avoid the common trope of using try & retry gameplay by reloading your previous save, which is inherent to the series (and the genre) by having an excellent gameplay outside of the stealth approach, when the action starts you don't feel you already lost by having poor mobility or a gimped weapon or slow aiming, you have plenty of tools, tactics, CQC moves, gadgets, smart interactivity stuff like puddles of water to electrify via the use of gadgets for ex to take out many enemies all at once (without killing them), it's flexible enough in that sens.
The movement in the game is amazing as Sam moves fast enough trough the area to climb any obstacles smoothly to either take out bad guys, reposition or escape a situation if you got caught, you're the predator and you completely own the place with that mobility.
Which all peak in the minute to minute gameplay, the quick thinking you have to get to clear a room or area by scouting (if possible) to determine who to take out first to unlock your John Wick instant kills perk that will take care of the remaining group and the feeling of feeling like a bad-ass is something this game excells at.
So yeah bring on the Remaster and give it a second chance, I think it's an underrated game that didn't got a fair chance at release due to Splinter Cell Conviction being so different and alienating the fanbase, hell I didn't buy Blacklist back then because to me Splinter Cell has peaked with Chaos Theory (and still does) and I was bitter that my beloved series tried to catter to a new playerbase, how wrong I was to skip it.