Eh, Winston is effective against Genji, but not necessarily a hard counter given his mobility and Winston's low DPS. You also lose Winston's primary purpose of disrupting the opposing team's backline when he is instead chasing a ninja around his own backline. Lastly, good teams will pair a Reaper with Genji to rout Winston. Mei doesn't work either given dash escape range. Roadhog is likely the best imo, but you end up gambling with the shotgun blast since a Genji holding reflect post-hook can sometimes get it up before the hook follow-up.
Keep in mind we're talking about Seagull-lite Genjis, not QP derpjis.
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