After finishing my recently gotten x-mas gift (aka. Spirit Tracks) I can make afew comments on it.
I plays pretty much like Phantom Hourglass, but it is somewhat easier I think (or is it the fact that I already played the other one). Anyway, the story is decent, and the tower especially, where you have the puzzle that you need to do with both characters are real fun.
All in all I'd give it a 9/10 as it doesn't have a lot of new stuff in it, and only has a few hard parts. But it makes it a lot easier for the non-Zelda fans.