I agree. From what I've gathered, people don't like the eyes, the teeth, or the elongated arms because they find these features to be less cute and appealing than the features of, say, the Pac-Man World design.
I can understand that point of view, and if it were just in picture, I would agree wholeheartedly. I don't feel like the character art pictures Namco has for Ghostly Adventures quite capture how animated and cute he can be in the show. They feel very static, whereas in the show the blue eyes, teeth, fingers, and arms all add to his animated nature, and it looks amazing in my opinion.
I feel like even though classic Pac-Man is more iconic, it's nowhere near as animated or full of personality like the GA design is. But it seems that opinion is the minority, which is fine.