Back when this game was announced in E3 of 2017 when the Switch was still a freshly released console who would've thought it would've taken almost 10 years for the game to come out and it would be 18 years after Prime 3's release, 15 years since the last "mainline" 3D Metroid and multiple 2D games in the series would be released. This also isn't including the massive boom with Metroidvanias in recent times. A lot has happened during the time it took for Metroid Prime 4 to release. After playing this game and while there are some notable flaws, it's rather impressive how much Retro Studios was able to salvage what was already a messy skeleton that Namco Studios made.
This is what caught me by surprise when booting up Prime 4. In spite of the fact it has been 18 years and 2-3 console gens later after the Wii, Retro working on two Donkey Kong Country games and not working on the series in so long, Prime 4 felt like it could've came out a few years after 3. The musical motifs, the look and asethethics of the series, the immersive touches like seeing Samus' reflections on her visor, the game feel all the way down to the auto locking and morph ball physics, it all feels in line with the series. It feels like a Retro Studios developed Prime game in spite of the very long time gap.
The visuals on Switch 1 are also impressive even now and the fidelity felt like an evolution over Prime 3. The only big downer is the super long load times.
With all that said, if you wanted a Super Metroid styled game in 3D like Prime 1, this game won't scratch that itch. In fact, it scratches a different kind of one. Prime 4 is more Zelda than Metroid both older and elements of the open world games.
This leads to the first negative. The shrines are completely pointless since progression in the story locks off your ability to complete them. New Zelda lets' you complete it's shrines in a varieity of different ways where Prime 4 has you do them in one way where you need a certain ablity to do them. Also doesn't help that the map never marks which shrines as not completed.
I'm not the biggest Zelda and I don't care for the overworld Prime 4 has much like older Zelda. If one good thing I can say about this is that if you know to constantly collect the green crystals while travelling around throughout the gme, it will be the shortest late game fetch quest in Metroid Prime history. It could be the longest if you don't know. I did wish the game did a better job at making this clear.
Story also is just there and isn't that great. Not the worst but it just exposes how Samus just feels like an overly expensive moving action figure when interacting with characters since she never even says anything nor do we know her inner thoughts like in Metroid Fusion. It made sense in Prime 1 and 2 since she never has to interact with anyone in those games but it exposes the problems in Prime 3 and 4. The npcs are moderately entertaining if nothing special. Them scarificing themselves the first time being a fake out but then dying for real against Sylux just made their actual deaths diminish the emotional impact. Sylux doesn't have much of a prescene in the story than fighting Samus a few times and then having some weird backstory.
Positives are that once you get past the tedious parts of trying to get to the dungeons like in older Zeldas, the dungeons themselves are pretty interesting like going to the Volt Forge to get the power on. Trudging your way through the Ice Belt with how windy certain parts of the level was. Fighting your way while escourting the characters in Flare Pool and having that really weird fake out countdown sequence or slowly going though the Great Mines and fighting off the Greivers while going through it.
The bosses are mostly solid with the worst being Sylux Phase 1 due to the reviving of teammates you got to do. I did enjoy the boss fight with Phenoros where there is decent specticle and good amount of challenge in dodging it's attacks while you are on the offensive. It was also nice to see the motorcycle get use outside of just only open world traversal. The only awkward part is remembering to use the control beam to finish off the boss. It pops up so infrequently that I always forgot I even have it. Same goes for the psychic glove.
I also enjoyed fighting the Omega Griever since it follows the formula of Metroid Prime bosses of finding out on how to damage it then dodging it's attacks and finally doing enough damage to finish it off. It hits the right spot at being a puzzle and having a good amount of action. My only big issue this time around is mashing A to get out of a boss' grab attacks since I hate doing mashing sequences in any game.
Final issue is that it did feel very grating that some switches had to be scanned while other could be interacted with by just pressing the button.
Overall, MP4 was an enjoyable game in spite of major issues. Games that take almost a decade to release could be worse than this.