Are you sure it's all negative? Because on my steam the base game is "Mostly positive". The DLCs are "Mixed" and outside of the The awakened king I can't say much about the DLCs.
As for my short review. I'm not sure what those people think Remnant 1 was about but for me it was unique worlds, unique builds and unique enemies. Those things together give you an unique gameplay experience and Remnant 2 expands on all of those things.
The aesthetic was excellent in Remnant and Remnant 2 continues that by making those worlds even more detailed. There were multiple times where I just looked in awe at what the artists had concocted together. The only time where I felt the artistic vision wearing thin was literally the end of the game. I have vivid memories of all the worlds that are available in adventure mode, the final area ended up being unremarkable compared to everything that had come before it.
The builds in Remnant were pretty unique but I personally felt like the game didn't give you enough tools early game to mid game to really build something out. You had guns, armor, trinkets, traits and mods but it all felt kinda constrained. Remnant 2 expands that by additionally giving you class archetypes, weapon mutators and you can modify the relic (the heart thingy that heals you in Remnant 1) and add relic fragments. All all those things individually are also expanded. Compared to the first game you're going to get more guns, more armors, more rings, more amulets, just more of everything necessary to make a build.
The enemies in Remnant were great, an excellent mix of small enemies, minibosses and big bosses. Remnant 2 expands all of them with an even greater mix of small enemies, minibosses and big bosses. I'm not going to spoil any bosses but I definitely found them fun and memorable. The final boss is the only exception that comes to mind as I remember that being a frustrating fight.
The only objectively negative thing I can say about Remnant 2 was the performance. I don't know if they've released some patches for it, but when I played around the launch of the awakened king it was borderline unplayable without upscaling.