So, I'm going on nothing more than gut feelings either, but the key differentiater for this game is going to be price. You're not shelling out for peripherals, so it's the budget priced rhythm game. Rock Band is a huge investment (especially with no DLC on Wii), GH is also significantly more than a bare-bones $50 game, but this offers similar seeming gameplay using no additional hardware.
GH and Rock Band really have a cultural zeitgeist going for them, with appearances in non-gaming media. If this can tap into that, I think it can do very well indeed, especially given the nature of the Wii's install base. It's that typical Wii owner who doesn't want to spend huge sums of money on bulky peripherals, but might well plump up the cash for what they perceive as a similar experience at a lower price point.
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GH and Rock Band really have a cultural zeitgeist going for them, with appearances in non-gaming media. If this can tap into that, I think it can do very well indeed, especially given the nature of the Wii's install base. It's that typical Wii owner who doesn't want to spend huge sums of money on bulky peripherals, but might well plump up the cash for what they perceive as a similar experience at a lower price point.