I'm playing through OoT now for the first time (on the VC), and while it's definitely a much harder game than TP, that's mostly because it makes a lot less sense and the controls are so much worse. The *vastness* of TP is far far beyond OoT (which feels tiny and lifeless by comparison). The only area where TP comes short of the previous games (especially MM) is in the number and depth of NPCs, which to me is the obvious direction to go with the next edition (especially since the Wii has so much more memory and especially data-storage potential, there's a lot of technical room for persistence in the world there wasn't before)