*Metroid series spoilers*
Also, Adam sucks because his "sacrifice" was dumb as hell.
Fun fact: This is because he was supposed to die about halfway through Zero Mission. If you read the manga, near the end it shows Adam stalling Ridley while Samus is on her mission on Zebes. Few pages later, Ridley attacks Samus. A few pages after that, when Samus thinks about all of her allies, Adam is grouped in with the dead characters (for example her parents). It's never outright stated that he died, but it's heavily, heavily implied.
They brought Adam back for Other M, then at the end they were like, "oh ****! oh ****! This contradicts Fusion, quick have Adam sacrifice himself."
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"The courtroom is the garden of holy judgment. Those with lechery in their hearts should leave this sanctuary at once!" ~Franziska von Karma