How was your experience with Prime 2? It's my least favourite Prime, but god, how I love some of it's boss battles. Quadraxis was so oppressive and intense.
I enjoyed it. It was a lot different than Prime 1 in ways and I really liked that fact. I loved exploring Sanctuary Fortress especially the outer verticality of it, not that the other areas weren't interesting but we had already seen swamp/forest and desert/plains in Prime 1, and the dark aether/light aether mechanic was utilized in an interesting way. I feel like they could have made some better puzzles with it and with something like the echo visor since that seemed like a last minute addition. I did however enjoy the fact that the dark aether usually had different rooms to the light aether counterparts. The fact that it wasn't exactly the same room, just mostly the same size and shape, was great. So you'd come into what are basically new environments.
Dark and Light beams being ammo based is weird. I disliked that fact and don't understand why they, unlike the super bomb/missile doors, didn't make the doors completely disappear with that necessity after being used once was odd and at times annoying. I never had a moment where I completely ran out of ammo but it was always a worry that I felt was unnecessary to have given that in prime 1 the other beams had no such thing.
In terms of boss fights it was a mixed bag. The first two guardians were fun but I found them too easy, especially the fly. Quadraxis on the other hand is I think simultaneously my most and least liked boss fight. I enjoyed the oppressive and tense environment it was in especially since you had no light bubbles to help you, but goddamn is it obtuse in the beginning to hurt and the last part with the antennas was just godawful. I don't know if it was due to my poor positioning or if it's just a Metroid Trilogy thing but I couldn't lock on to the ones on the head and it caused me to miss my shots all the goddamn time. Dark Samus had some fun fights, except the last one which I felt was overly easy due to the time limit element. The one at the top of the elevator was great. Emperor Ing was alright, except for its last form where I could only hurt it using the light beam since the dark beam's shot is so fucking slow. Oh and going back to the beam complaints, the two charge shots for dark, light, and annihilator beam? Useless. Never bothered with them after trying it out once.
In terms of the story itself I was kind of pissed U-Mos didn't do more. He was so passive, yeah he had to guard his people and this is Samus' game but I would have liked to see something more done with that character especially since I just loved his design. Speaking of which, the dark and light suits. Holy shit, amazing looking except for the dark suit's shoulder pads but everything else is great. One thing that bothered me though is that it seems that in all the suits Samus has she's wearing thongs, it's weird.
Best part of the game though is something I saw in a video before I played this. The video details why Other M is so shit, and in it the guy uses how Samus reacts to Dark Samus as a point. I agreed with it in the video and I loved it even more seeing it here. I remember being sketchy on people wanting Dark Samus as a playable character in Smash, thinking that it'd basically be her version of Dark Pit, but hell if she isn't her own character. I love her little tricks and differences to Samus' usual arsenal. I would love to see her continue to become more of her own entity. I haven't played Prime 3 all that much yet, only the first hour or so, so I know she's back in that. I'm guessing she dies in it too but I really enjoyed the little nuances she has to her moves and how Samus reacts to her whenever they're together. Samus showing no fear and being the badass we know she is and not that awful Galactic Federation propaganda smear/Fever Dream version of Other M is just amazing.
I wrote a lot more on that than I thought I would, to summarize: I had fun, don't think it's the best Metroid game but I had a good time. I need to play Prime 3 to see where they stand compared to each other.