He didn't know what Peter Parker looked like, just his identity. Harry could have told Electro in TASM2 "Spider-man is Peter Parker"
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Ehm, no the 1-5 or 1-10 does not do anything with the fresh raiting. When critics are raiting a movie on RT there are 2 options they can choose from. Fresh or rotten. Then they also need to put 1-10 or a 1-5 score for some reason. However those does not impact the "fresh" raiting.