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is this sentence grammatically correct or is it fragmented?
"Whether one is reading a book, watching a movie or visiting a museum, in all likelihood the novelty of it has been tainted by the prevalence of reviews and summaries."

It is poorly worded. There is a verb and predicate, so it technically isn't a fragment. But the sentence after the comma needs work.

"Correct" grammatically, confusing stylistically. Also... use an Oxford comma