You don't need nostalgia to notice something looks worse than an original release on top of the blatant downgrades like lighting, where the projectiles no longer light up the environment in the demaster. When something is called a remaster I expect it to look like a better version of the original game, much like a proper film remastering. Not a revision of the art style with missing elements. I have no nostalgia for metroid in fact I have only completed the Metroid Zero Mission remake on gba last year. I'm as new as you can get here.
The new volumetric lighting (or in other words a developers half assed way of making lighting meld together into an ugly blurry blob) simply doesnt work and only obfuscates the visual fidelity the remaster has going for it.
You no longer have the developer trick to see Samus's reflection. Its flat and missing in the remaster. Most small details that lended a lot of credence to the gamecube as hardware are just fuckin gone. Which is hilarious, since the remaster is supposed to be a remaster.

So why is it missing? There shouldn't be any excuse, the original code is still running yes?
Lets look at light rays. This is a missing element too even if the original was a little overboard.

My problem with the remaster, purely visually, is that it has no real identity anymore. It looks like every other fucking game you've played now. No soul. The new thermal effects are also messed up, it lacks depth. Here's a takeaway, it "lacks depth". Theres no bite. Its all sanitized. The texturework and models are all cleanly done. It looks boring. Reminds me of crash bandicoot's remake. By-the-numbers and less identity for the sake of modern techniques. If you love it, you'll love it. But if you're sick of it I don't see any redeeming quality here compared to emulating it.
Do you notice something WRONG here?

The rain is just straight up less of a presence which negatively affects the atmosphere. No clue why they did this. When you have volumetric fog I imagine you should make it even thicker not clearer for a foggy, murky, rainy scene in the original. Inb4 it's because they "wanted to maintain 60fps".