I only played the first couple hours of this and am planning on "finishing" it by playing AM2R, but I'm glad I gave it a chance - the innovation over Metroid 1 basically paved the way for the rest of the series.

Almost a flawless game except that the Mother Brain fight is the worst thing imaginable

The best ever game that has aged into total unplayability

The incredibly rare case of a game being apparently not great anywhere but on the Wii port