Reviews (from Opencritic):

Attack of the fanboy: Metroid Prime Federation Force's greatest crime was its name. Had the game not tagged itself with the moniker of one of the greatest games of all time, it could have stood on its own merits quite well. If you take all those pre-conceived notions of what a Metroid game should be and set them aside, Metroid Prime: Federation Force will easily surprise you with its quality. It's nowhere near the all time greats, but it can deliver some enjoyable moments, and will definitely entertain for some time. Just make sure you have some friends to tag along though, because the solo experience is quite a different story. 7/10

Kotaku: It's actually very good! A smartly-designed and surprisingly-strategic shooter best played in co-op. (no score)

Nintendo Life:  We look forward to seeing what the future of this particular spin off holds, because as it stands right now Federation Force is an impressive and solid foundation; it's more than able to satisfy hardcore Metroid fans until the inevitable return of Samus Aran 8/10

Dual Shocker:  Hidden underneath the wonky control scheme and irreverent use of the source material, Metroid Prime: Federation Force is overall a good game, held back by limitations of the console as well as bizarre design choices. Fans of FPS’s will likely enjoy not only the experimentation the game has to offer, but also the fun you will find with friends. 7/10

Destructoid:  I was holding out hope for Metroid Prime: Federation Force, but at this point, there are so many other dungeon crawlers that are worth your time. Just like Hunters on the original DS, the main questline of Federation will probably fade out of the limelight over time and become a whisper in hardcore Metroid crowds -- though I can see Blast Ball having longer legs. 5.5/10

USGamers: Federation Force has proven to be a pleasant surprise, and my feelings on playing the game quickly went from "reluctant dread" to "respectful delight". (no score)

CGMagazine: Metroid Prime Federation Force is not only the best FPS on the 3DS, but perhaps one of my favorite FPS games ever. 9.5/10

IGN: Metroid Prime Federation Force has some neat ideas, but they’re soured by an impotent and boring primary weapon that sucks the enjoyment out of shooting and a bewildering lack of special ammunition that might’ve brought variety to the action. 5.9/10

Gamexplain: "liked it a lot"

                
https://www.youtube.com/watch?v=Zk_Dt_BZ8dA

Naw most hated game on Youtube would be Call of Duty IW.

But anywho, don't care enough to give an exact so I'll just say 65-75. Blast Ball is pretty good so how bad could the rest of the game be!? I'd also like to assume reviewers aren't gonna pull another Tropical Freeze and flag the game because it's not mainline Metroid, but yeah they definitely will!

3.5/5 it's okay

I played some rounds in the demo with other players and it wasn't Rocket League but it was decent tbh

62, also MP:FF doesn't go anywhere near CoD:IW levels of hate

I legit hope it surprises everybody and turns out to be better than expected. I also legit voted for under 60.
It's up to MPFF now...."Prove me wrong children. Prove me wrong!" - Seymour Skinner

Could be 68/100.

65% If its above 75%, I will question life

65% If its above 75%, I will question life

60, but I would love it to be around 30-40.