Honestly, though, you can stick a fork in the story because it's more or less done (even though there are still options; we've discussed them on this board at length), the Primes were generally good but nothing outstanding, and people are seeing the 2D games for the backtracking, Power-Bombing, snorefests that they were.
It's why MMX didn't get more votes; another Metroid game would probably be as 'meh' as every other recent game just like X9 might be 'meh' to terrible. Metroid needs a gameplay revamp, and MMX needs to ditch Ride Chasers and Rankings.
Atomic rage. Metroid is no where near dead from either a gameplay or story perspective, not with the amount of continuity that needs to be properly handled in between 1 & 2 with the Prime series. Then there's Fusion's ending which suggests that the organized universe itself could pose to be Samus' biggest enemy, more so than the Pirates.
And hell, since most people probably won't play for story purposes, if we had to create Metroid at the basest level for a new game, all that needs to happen is Samus gets on a planet, someone tells her blow [parasitic bomb] up and from there it's mockball time.
Secondly the most recent games in the series were Prime 1 - 3 which were amazing, beyond amazing, and not quite as amazing, but great respectively.
I really have to wonder why someone would consider Metroid boring though, there's just too much put into each game from all angles (design, art, music, gameplay) for me to comprehend it. Then again, this is all just the thoughts of a fan so disregard if necessary.