Starfox Adventures.
How you go from the epic that was Starfox 64 to a watered down Zelda without any of the cleverness of that series and with some of the most painful voice acting I've ever encountered is beyond me.
Resident Evil 5
Again, a masterpiece (RE4) followed up by a ham-handed mess. It wasn't scary, and the forced co-op sucked.
Mario Sunshine
"Hmm, how should be follow up the amazing and groundbreaking Mario 64? I know, let's have him work as a janitor washing grafitti off a series of monotonous tropical resort levels!"








