Well, the werehog caused Sonic to "unleash" his primal instincts, so the title fit. However, I prefer 'Sonic World Adventure'. Though I don't refer to the game as such.
A few awful game titles in my opinion:
MTV Sports: Skateboarding Featuring Andy MacDonald
Game for the Dreamcast, ridiculously long title.
Who Wants to Beat Up a Millionaire?
Stupid title, stupid cover art probably equals stupid game
Grand prize winner:
Sonic the Hedgehog (2006)
The "(2006)" is a big clue as to why this title is awful. As the game took the exact same title of the first game, but had nothing common outside of Sonic vs. Dr. Eggman, the game will FOREVER be referred to as anything BUT what it is actually titled. "Sonic the Hedgehog" will always refer to the 1991 game, while "Sonic the Hedgehog" (in reference to the 2006 game) is ALWAYS given the 2006 date tacked on: "Sonic '06". Alternate titles include "Sonic Next", "The really shitty Sonic game" or "Silver the Hedgehog".