Seems to be a lot of confusion around this concept so I thought I'd help out.
First of all you need to go to the archetype stats this will aggregate all the winrates of a certain deck category. This is helpful do get a proper view of how certain champ combinations are actually perform outside of tech choices like oh I added two rite of negation and shifted my winrate by 2% its like okay but you could do that in any deck so who cares...always look at the aggregate for the archetype.
https://lor.mobalytics.gg/stats/archetypes
The second thing is aggro performs on average 5% percent better in LOR due to punishing greedy decks which they will ocassionaly que into and auto win against. Free wins are massive when we are calculating overall stats.
So for example Zed Poppy might have an aggregate winrate of 59% making it the best deck in the game, but in a tournament setting where every deck is built properly to deal with aggro you can expect it to win closer to 54% and on par with control/midrange
The second thing is a control or midrange deck that wins 54% of the time is fully optimized, so Lux Jayce, Darkness, Dragon, Discard, Lurk they all share this magic number.
The third thing is if a deck is listed on mobalytics and is winning 50% of the time its essentially a tournament deck that is built poorly for ladder, I would make heavy adjustments before taking it online for a spin
Thats Lor meta stats in a nutshell, 59% for aggro is good, 54% for everything else, and 50% means adjust before taking online.
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