I have over 200 hours in Dread. And I'm freaking stuck at the final boss on run time for hard mode that I want. But it's been so long now I have no idea how to control Samus anymore.
Super is really my most played. Played it when it first came out, and replay it probably once every year or so. Randomizers and hacks are awesome too.
Same for me, I don't know if it was because it was the first Metroid game I played on the release of for how the game feels in general but wow, I was addicted for weeks.