It failed completely at being a Metroid game. It's obvious the single-player "story" was just hastily hacked together from the multiplayer mode.

Maps were linear, without any kind of secrets or exploration. They were mostly boring corridors between multiplayer arenas for fights against bots.

The only abilities were different coloured guns, and while the MP trilogy gives the four beams specific properties to interact with the environment, I can't remember what most Hunters guns were supposed to do beside opening corresponding doors.

There were three boring and mostly static bosses in the whole game, two of them copy pasted once to make it last a bit longer.

I don't even think its controls or arena map design felt like Metroid Prime. The very limited Metroid Prime 2 multiplayer felt more like "competitive Metroid Prime". It was more fun to me anyway, not that I'd buy a Metroid game for multiplayer.