I agree, but DK and Metroid got some pretty solid stage representation through the ages. DK had:
Congo Jungle
Kongo Jungle
Jungle Japes
Past Stage: Congo Jungle
Rumble Falls
75m
Past Stage: Jungle Japes
Past Stage: Jungle Japes (again lol)
Metroid had:
Planet Zebes
Brinstar
Brinstar Depths
Norfair
Frigate Orpheon
Past Stage: Brinstar
Pyrosphere
Past Stage: Brinstar
Most of these stages suck though.
Congo Jungle - This one was actually okay, wish they'd bring it back.
Kongo Jungle - Rushing water and random klaptraps.
Jungle Japes - Random klaptraps.
Rumble Falls - Horrible scrolling stage.
75m - Way too big and arguably one of the worst stages in the history of Smash.
Planet Zebes - Shitty rising acid.
Brinstar - Shitty rising acid.
Brinstar Depths - No ledges, and awkward terrain.
Norfair - Shitty rising lava.
Frigate Orpheon - This one was actually okay.
Pyrosphere - Based on a shitty game, plus Ridley's probably a boss character that will ruin the stage like the Yellow Devil ruins the Mega Man stage.
I just want a great Metroid Prime stage and a great DKC stage. Is that so much to ask?