Píngjià yí bù zuòpǐn yào quánmiàn, bù néng yīgùnzidǎsǐ.
A work should be evaluated comprehensively — you can't dismiss it with one stroke.
Tips
usage
Colloquial and vivid. Typically used in the negative — 不能一棍子打死, 不要一棍子打死 — arguing against overreaction to a single flaw. Common in management, criticism, education.
memory
Picture one 棍子 (stick/club) swinging down to finish the argument. Overkill — hence the negative usage warning against it.