Animation wasn't on sync with the voices, voice acting was quiet and generally poor.
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To answer your question about why "paint splattering" (formally known as drip painting) is considered art, let me give you a small art history lesson.
The person in question's name is Jackson Pollock, and he was a war veteran that struggled with alcoholism most of his life. He painted formally before doing his famous drip paintings, but moved to drip painting as a form of expression. To express his deep rooted emotions, the style of his painting and his color choice reflected it, instead of what the picture actually his.
That's why it has artistic value; because no one had done it before, and it was artistic expression in it's most pure form. Whether or not that has value to you personally is up to you.