Okay, I'm a bit frustrated by Nintendo mismanaging the Metroid IP personally despite having interest in Federation Force & really liking the gameplay I saw of it. But you are coming of too antagonistic and bile toward the Metroid fan base.
They got NOTHING for six years and many people loved & enjoyed the games you listed that people had issues with.
-The first two Metroids are iconic games and despite aging, are fun titles
-Super Metroid IS a fantastic game and desirves the reception it got
-The Prime trilogy is great and while Echo's & Courrption have issues, they are still fantastic games
-Other M is horrible if you count the story but if you can ignore it (very hard for me personally
) its a fun mindless action game. Just a very poor Metroid game sadly but not a bad game overall.
Metroid is a series that does alot right and people have a right to want more. People were sour about AM2R being taken down because it was a NEW 2D Metroid game, something Nintendo hasn't produced in 12 years.....of course the fan base will be pissed that the only new traditional game in ages got DMCA takedown's (even if Nintendo had the legal right to do this & that the developer behind the fan game could have pitched the game to Nintendo).
Federation Force shows the darker side of the Metroid fan base, as the backlash it got is a blend of three things; pent up anger toward Other M's issues, the lack of a mainline game in a long time, & the game not being a traditional Metroid game.
Critics state that the game is mixed; you either love the game or you hate it, but in the end Federation Force is just a 'okay' or 'good' game. Not the horrible waste of a game its made out to be online.
You have the right to be upset with the sometimes 'silly' reaction of Metroid fans have toward the series now, but look at it this way; what happens if your favorite franchise is put on hiatus for years after a game you might dislike releases in that same series and the only new game in the series is a spin-off you might not be super interested in.
But this is NeoGaf, one of the most toxic places in the gaming community sometimes, so what do I know, right?