Of course the setting of Sonic the Hedgehog does not fit with the Zelda universe at all, whereas the Dinasty Warriors games are far closer. Sonic and friends does not use weapons at all (except in that Wii game), at least swords are common in Dinasty Warriors. But it's still the same case: you are copypasting a completely different franchise and then making the least amount necessary changes to pass it as a Zelda-related work. Four Swords was a derivative game and it had many changes, Link's Crossbow Training was a derivative/semi-different game and it had MANY changes the Tingle games were completely different games (again Tingle's Balloon Fighting being the only exception, but it was a copypaste of Balloon Fighting). They all have at least some effort and work behind, whereas Hyrule Warriors doesn't. Please consider than here I'm not even talking about Dinasty Warriors's quality like I did on my first post, nor I'm defending the existence of Link's Crossbow Training and similar. I'm just speaking of pure, raw human work put into the game by its developers.
I'm curious as to how you know exactly how Hyrule Warriors plays or how much originality it has when it isn't out yet and we have very few details on the game other than that it's a crossover. 
That's my only issue with this paragraph, that you're comparing the effort behind released, known games and a game that has barely any info released. And honestly I wouldn't call Link's Crossbow Training that original, it's just another lightgun game really. In the event you're right, then yes, sure, it won't be that original, but until we know more details, you can't really make that claim; literally all we know right now is that it's a crossover, nothing more. I don't intend to debate the originality issue should be right, but until we know for sure this is the case, you can't make that claim. 
But agree to disagree we shall.
One last thing I thought about with this game is that it's actually kind of a clever marketing ploy. ... or would be, if the Wii U was more successful. What I mean is, you have a large Zelda fan base and a large Dynasty Warriors fan base, right? Mix the two together, and you got Zelda fanboys going "Hey look, a game with Zelda stuff in it, let's check it out!" and Dynasty Warriors fanboys going "Oh, another spinoff game using a different franchise, might as well check it out." They play it, they enjoy it, they want to see what the other franchise is like, it's marketing for both sides. However I do admit this probably will end up working better in Dynasty Warriors' favor, since I don't think many Dynasty Warrior fans own a Wii U, but Zelda fans will. Still, while I'm definitely not suggesting more franchises should crossover advertise this way (though it's been done many times by now, mostly in fighting games), it's a solid idea. ... just, would've been more solid on a more successful console, unless they think they can move Wii Us with this game. Do I think it will? No. But Mario Kart 8 and Smash Bros. will, and someone might decide to pick this up on the side. Might. Not trying to be too optimistic here, much as I do enjoy the Wii U.