If they made a Nintendo themed Candy Crush Saga would you suddenly become interested in that?
In some cases, sure. You can play regular Tetris or you can play Tetris with Nintendo themes on Nintendo DS. You can play Puyo Puyo on its own with generic anime type characters or you can play it as Kirby's Avalanche with Kirby characters or Dr. Robotnik's Mean Bean Machine with Sonic characters. You can play Dance Dance Revolution on its own or you can play it with Mario characters and songs in Dance Dance Revolution: Mario Mix.
There's nothing wrong with aesthetic skins on other games. Sure, it might not be a traditional Kirby or Mario game but the game that they have been grafted onto can still be fun and it may be the way to get you to try a series you might not have done so previously. Even if you like the game already on its own, blending it with other elements from another game you like shouldn't make it less fun.
I've never played a Dynasty Warriors game before but then I can't recall it ever being on a Nintendo console before. So, I'm intrigued by it. I'm still not sold on it and would like to see more footage and feedback on it but it has done its job of getting people to notice the game/franchise that might not normally pay attention to it. And with the 3rd party problems of Nintendo being documented, it's probably a smart choice for a 3rd party to graft a Nintendo franchise onto their game as the userbase is clearly more inclined to select or choose games involving Nintendo franchises.