he apparently disliked the study of Homer, seeing it as a waste of energy
Regarding critique of form, Epicurus disapproved of the study of Homer in terms of comparative literature and analysis of poetic meter (which were very popular pastimes among the elites in his day -- elites who were not inclined to take Homer literally, but still had a lot of respect for his work from a cultural perspective).
Regarding acceptance of content, Epicurus also disapproved of Homer being so highly respected among the middle class, who were more inclined to take Homer literally, and who viewed Homer's work as an ancient source of actual information about the gods.
However, regarding critique of content, Epicurus certainly did approve of studying Homer in order to criticize his content.
According to Plutarch (Non Posse, 2, 1086F), Metrodorus himself "rebuked (λελοιδόρηκεν)" Homer "in many of his writings."
In his criticisms of Homer, Metrodorus wrote about "the poetic rabble (ἡ ποιητικὴ τύρβη)" and "the foolish sayings of Homer (τὰ Ὁμήρου μωρολογήματα)."
So Metrodorus produced multiple books about Homer, digging deep into his specific claims, and highlighting their absurdity.