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Giolito's been the 28th-best starter and Marte, who you got for Springer (who went on the IL twice more after the deal) is actually the #1 outfielder in fantasy on the strength of his average and steals.
Your big blows are Glasnow (dominant for a third of the year but now completely out) and Yelich, who's definitely underperformed though oddly has a really high OBP anyway.