Lego Creator (better camera controls, more bricks, better physics, better graphics, custom brick plugins/addons)
I would pay to see a Psychonauts sequel
Spore. With people that'll do it better.
warcraft 3
if a game truly is "the best" then it deserves more content
LSD: Dream Emulator
I'd start a riot to see a sequel to Conkers Bad Furday
yeah, but you know what happened to rarethey changed