Back with new data. WuYang was not enough to bring OW out of death spiral it seems to have fallen in. See you at Season 18 launch!

Worst (lowest retention highest)
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S15 — 56% retained (44% drop)
S16_Hero — 63% (37% drop)
S6_Hero — 67% (33% drop)
S17 — 73% (27% drop)
S8_Hero — 80% (20% drop)
S7 — 82% (18% drop)
S13 — 85% (15% drop)
S11 — 86% (14% drop)
S12_Hero — 86% (14% drop)
S10_Hero — 86% (14% drop)
S9 — 91% (9% drop)
S14_Hero — 97% (3% drop)