Actually, this article tells why they're so difficult (the first one at least). It's kind of sad...
I bought Uprising almost two years ago. I wanted to buy it earlier, but I was using my money for Skylanders back then! I wasn't expecting the dialogue either, but it's a brilliant touch, considering how many Nintendo games have silent protagonists- heck, even the originals had a silent Pit! I agree with you with the voices dialogue. No other game I've played has pulled it off as brilliantly.
