Like others here, I have no problems with characters in the countries. They don't change the major theme/message/feel of the pavilion and are just additions of things to do. And what is best is they are temporary. Should the next manager or who ever should decide they no longer wanted meet and greets, they could be moved with little or not hassle.
However, making permanent changes to the rides is different to me. It adds nothing to them and most people are riding those rides because they want to be immersed more into that country. I can live with or without Donald in the Mexico ride. As others have said, at least the ride is still about going through Mexico and its traditions/tourist points. I would prefer that Donald was removed just so it matches the 'realism' of the rest of the countries. What they are doing in Norway is so offensive to me, I can't stand it. Between the ride, the meet and greet, the museum at the Stave, and the merchandise...it's just too much. Why even bother calling it the Norway Pavilion?
What they should have done was take that pavilion space between Mexico and Norway (their new character meet and greet area) and just build a full on Arendell Pavillion. Make the facade like Norway or something like that so it matches the realistic country atmosphere and then have all the Frozen stuff there. It should all fit, right? The ride, the museum, the stores, the character dining, meet and greet...all of it. Then Norway could be it's own unmolested place. They would never do it, I know. but it would be nice and I could choose not to bother with it if I didn't want to and still ride my Maelstrom.
And I still think they should just redo Blizzard Beach and make it a Frozen them Park. Seriously....how much cheaper do they want to get? It's all right there!!! lol