I haven't watched the movie yet, but judging by the Diancie one, I can imagine what to expect. The battle between Yveltal and Xerneas (if we can call it a battle), did it really stop just because of Xerneas looking at it? I just couldn't believe it the first time I watched it.
The first one that really bugged me was Arceus and the Jewel of Life. They made the creator of the universe seem like the weakest, and most foolish creature ever. I don't know why is it so difficult to write a script that follows the story of the videogame, it would make even more sense with the rest of the anime so it wouldn't look like something completely apart, almost like in a parallel world. So at this point I'm already used to the lack of creativity in the stories.
But it's true the quality of the movies themselves has decreased each time. Genesect wasn't that bad, but it was more like a especial episode. Keldeo was entertaining, but the drawing was so bad it was really distracting, and I also feel that Kyurem and its forms, deserved their own movie with Reshiram and Zekrom.
The anime has gotten better since the last seasons of Black & White, I just don't understand why it hasn't reached the movies yet. We all know it'll always be a kids' cartoon or movies, but I thought they had already understood they have a huge amount of fans that are young adults now. And I know they know, because they've showed some signs in different aspects of the franchise, they just don't seem to care about us at all. Imagine a movie with the quality of Pokémon Origins, it would be amazing, and it probably would get the chance to make it to the theaters outside of Japan.