Going off stuff I've read about it, the HD version of Twilight Princess is having some issues. Firstly while it was stated as being capped at 30FPS to 'remain true to the original', some people have seen that the game actually runs worse than the original at certain points. This laziness is getting really depressing.
That sucks.
It does suck for those that bought it for the game. Those that want the amiibo won't care and most likely will just trade it in.
The amiibo was another problem I had with the game. Really Dislike how a new dungeon is completely locked away if you don't have it, and you only get access to it if you buy the first print release of the game. But as you mentioned, people just looking for the amiibo likely don't care about that.
I haven't really noticed any problems with the framerate, myself. The graphics are so much clearer in HD. Doesn't look all muddy like it did on the Wii.
That's good then. Read other stuff saying that some of the textures looked a bit off, but that's really subjective unless it's obviously bad looking.