Well, I liked in SMG2 that they didn't just rehash Rosalina and brought in a different character. Made it feel fresh. And I'd like them to do that with the next game.
1. As long as you can get used to the different control scheme and the lack of a side-B move, yes.
2. If you like the original game, than I suppose.
3. Should probably wait 'till it's released and then rent it first.
Well, I do like the actual stage and the way it looks with that tunnel and stuff, I just don't enjoy battling on it.
New Pork City is both not fun to battle on and uninteresting to look at.