I believe 450s still hold the title of worst auto, even after the buff.
Their optimal ttk requires 6 crits without missing a shot.
By comparison, 360s are much more forgiving as you can land 1 or 2 bodies and still keep your optimal ttk.
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Pretty sure there was a small change to 450's this season and they have a lower time to kill than 360's and the same time to kill as 600's. https://docs.google.com/spreadsheets/d/1_6zsM7kzvg0aUT8YtM_-Wg_5K1gKDOlrwfVzutEjq-s/edit#gid=0