Graphics: 10/10
The graphics in Metroid Prime 4 are excellent; it makes great use of the Switch 2's capabilities. Everything looks very sharp and shiny. Visually stunning.
Sound: 7/10
The sound design is generally pretty solid. The music is good, though nothing stands out as being particularly awesome.
Gameplay: 7/10
I played using the Pro Controller and found that for the most part the gameplay and control mechanics were pretty good. Some of the default buttons are not intuitive, however, and I frequently found myself pressing the radio button when looking at the map screen or trying to summon the motorcycle when I wanted to access the menu, etc. Boss fights can sometimes get a little annoying since the auto-aim feature does not always target the weak points. This seems like an intentional choice to encourage (force) the player to manually aim, and might be more elegant using the Joy-Con 2 mouse controls, but on the Pro Controller it creates some awkward and frustrating battles at times.
Story: 7/10
Not a particularly deep story--you are Samus, on an alien planet, you have to get teleporter keys to teleport back hom. There is a cast of characters who also back you up as the game progresses: they have some superficial character traits and personalities. Overall the story is pretty run of the mill, but that's really all it needs to be; enjoyable for what it is.
Delight: 8/10
I found myself routinely delighted by the game--the exploration (although it can get tedious to backtrack later in the game) provides some great opportunities for playful discovery on a first run through, and there are some fun surprises peppered through the game. Oddly it got me thinking how interesting it might be to have a first-person Zelda dungeon-crawler type game. Hope springs eternal.
Overall: 8/10