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I head this somewhere but wasn't sure if it was true. The idea of Vader facing great difficulty in overhead strikes and blocks sound hilarious . How pathetic.

No.

According to Darth Vader: A 3-D Reconstruction Log it's true. I can't access the specific page, but it's the citation for the wiki on Vader's armor which says he had difficulty in raising his lightsaber to full height.

Yes.

No wonder he was only 80% of his power after he was Mustafared