It's happened to me before. I traded TWW for Twilight Princess :/ Uh...I also bought Star Ocean 4, that game was a HUGE disappointment in my opinion.
I really don't understand why fans think Melee is better than Brawl. Really, the only thing Brawl DOESN'T have is wavedashing. Besides that, I don't notice a difference aside from graphics and loading times of Brawl. Oh, and with wavedashing came a LOT of glitches, and I also respectfully see that Brawl is somewhat slower gameplay-wise than Melee. Still, the differences are marginal from a video watcher's standpoint.
I played MKDD and MKWii and honestly I found Wii to be superior. Multitude of configurations, physics for me were spot on, and the courses seemed so much better. Bigger perhaps is the right word.