Can people really justify why win rates don't matter?
A lot of champions like Zyra have consistently been in the top 10 win rates in the past season and yet still regarded as "weak", while Lee Sin is apparently overpowered being in the bottom 10. Every time win rate is being brought up, we always have those "know it alls" saying win rates dont matter, and they justify it with 4 utterly unconvincing claims:
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Underplayed champions have low sample size, so their win rates don't matter is untrue, because the win rate "number" you see on lolking chart is actually the win rate over the past 7 days. Even Urgot with 0.35% pick rate has ~5000 games over the past 7 days on NA server alone (lolking uses NA, EUW, EUNE, and BR data). That is a pretty good sample size if you ask me.
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Underplayed champions are only played by mains, while FOTM champions are played by mostly inexperienced players. This sounds logical except it is not backed up by statistics. Recent FOTMs such as Lissandra, Graves, and LeBlanc showed no change in their win rate over the past 2 months even though their pick/ban rate exploded. In addition, only a few of the underplayed champions (>5% pick rates) have win rates over 50%, so their "mains" aren't doing so hot apparently.
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Win rate doesn't matter because champions have different skill floors. This is true to some extent, but I don't think its sufficient to explain wider gaps in win rate. For example, is LeBlanc (46%) really that much harder to play than Ahri (51%) to have 5% lower win rate while being equally as strong? You have one less skillshot to land, and the only thing that makes LeBlanc more difficult is that you have to choose which skill to mimic. A lot of the highest win rate champions are mechanically intensive (Zyra, Vel'koz), while some of the lowest win rate champions are fairly faceroll (Jax, Tristana).
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Most players are in Silver and Bronze, and cannot play OP but mechanically intensive champions. This is again, not backed up by statistics. Lee Sin and LeBlanc have ~45% win rate in both Bronze and Diamond. Yasuo's win rate is actually 3% higher in Bronze than Diamond. In contrast, faceroll champions such as Akali, Ashe, Katarina, and Talon have much higher win rates in Diamond, even though they know that buying pink wards counters Akali and Kat ult can be interrupted.
The only explaination I can make about the win rate paradox is that solo que and competitive plays are two different games. In competitive play, ppl group much earlier to make picks and take objectives, so strong early game is more important (Lee Sin). Lane swaps can happen to avoid terrible laning phases that are unavoidable in solo que (Twitch). Champions are also picked for synergy with or counter to particular comps (Lulu). On the other hand, there are champions that have easily exploitable weaknesses in competitive play that are not exploited due to the chaos and selfish playstyle in solo que (Katarina, Akali, Fiddlesticks).
So win rates do matter for solo que, the game that YOU play in. While you have the freedom to play whoever you want, think twice about bandwagoning on any champion just because "its played in the LCS"!
tl;dr win rates do matter for solo que, the game that YOU play in, and all the "win rates dont matter" arguments can be easily refuted"
Referece
http://www.lolking.net/champions/
http://na.op.gg/statistics/champion/
http://www.leagueofgraphs.com/champions/stats/diamond/by-winrate