Innovative and quite different from the original game? Like Mario Sunshine? Or Dig Dug 2?
NO.
A sequel should be more of the same goodness that made the original game so much fun. Same play, same goals, but new missions. Soul Calibur 2 should be the same as Soul Calibur 1, but polished to perfection. Metroid Prime should preserve the same puzzle-solving exploration as the lovely Super Metroid. MP2 should be like MP1, but with a new world to explore.
You get the idea.
Thoughts? Opinions?