It depends for me. If the PoV switch happens often throughout the story then it's ok and if the writer can pull it off! Sometimes it just hurts the flow of the story.
If the story is written 90% in a character's PoV and then we get a sentence or paragraph in another PoV, then I consider that a mistake.
If the story is in Ron's PoV and a sentence is thrown in, like say, "Ron's knees ached." I think how could Harry know that, unless Ron told his or a preceding action showed Harry that Ron's knees hurt.
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If the story is written 90% in a character's PoV and then we get a sentence or paragraph in another PoV, then I consider that a mistake.
If the story is in Ron's PoV and a sentence is thrown in, like say, "Ron's knees ached." I think how could Harry know that, unless Ron told his or a preceding action showed Harry that Ron's knees hurt.