If Sonic Unleashed is supposed to be a third installment to the Sonic Adventure series then why does it have even less in common with the sonic adventure games than the Sonic the Hedgehog 2006 game?

Answer 1

Sonic Unleashed is not supposed to be Sonic Adventure 3. If it is then it will be because Sega are not good at making all their Sonic games run on one storyline.

What he said. And if it is supposed to be SA3 then it was probably made like that because Sega wants players to experience Sonic in a lot of different ways from classic 2D to swordplay.

It has been said by developers that this game was originally supposed to be Sonic Adventure 3. Read this: http://www.videogamer.com/news/sonic_unleashed_began_as_sonic_adventure_3.html

It, however, played more like Secret Rings and 2006.

This would have been excusable IF the game had the Sonic Adventure staples, (Sonic, Tails and Knuckles all playable, a story that wasn't too childish, but also not a melodrama, upgrade items, giving characters new abilities, making it more fun to replay beaten stages, chao gardens)

But Sonic Unleashed had none of those, leaving it lacking in replay value.

After beating a story that somehow managed to be childish for the beginning of the game, but then jumping straight to being a melodrama that still manages to be lacking in actual story development once Chip gets his memory back.

Sonic adventure, on the other hand, starts out using only Sonic, Tails and Knuckles, which lasts until the first sky chase level. At the beginning of Sonic adventure, the plot is simple, and to the point: Sonic and Tails are racing Robotnik to find the chaos emeralds, while Knuckles is trying to restore the shattered Master Emerald. Despite this, it's still complex enough not to be boring, and the complexity of its story gradually increases. After Sonic and Tails run into Knuckles, and Robotnik retreats to the egg carrier, then the story gets slightly more complicated. It's not until this point, that Amy, Big and E-102-Gamma are incorporated into the story.

Also, I absolutely HATE Sonic only titles.