Hi there. I've got ~150k mastery on Ashe earned this season. I've played her in all 5 roles, primarily the jungle.
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I get it, Riot isn't going to nerf Ashe right now because they want to reap that sweet sweet money from the legendary skin. But once you're done with that can we address why her ult is on 100 second cooldown at Rank 1?
First off, I want to note that Ashe has been this strong throughout the season (actually, she was stronger when Maw and Steraks stacked); it's just taken until now for people to pick up on it.
For starters, the most common build on her rushes ER which already gives CDR.
Secondly, Ashe's ult is a hard-engage, global range, pick machine. She can all-in in lane, push the wave, back, and show up in lane with her ult almost up again. Come mid-game she should have her ult literally every teamfight. Why is her ult CD much shorter than most ADC/Supports when her ult is one of the most game-changing?
You need crit from other sources to get the full cdr. So if you mean, she gets 30% cdr by the time laning ends, then you'd be right. But she's not showing up with a 70-second ult at level 6; she's got a BF and maybe a zeal, warhammer, or greaves, just like every other carry.
Meanwhile someone like Varus has a 110 sec CD ult (rank 1) and his doesn't even come close to the utility Ashe's ult brings.
Varus is a seige/poke champion who's as much an ad caster as a marksman. His ult is a highly effective counter-engage tool that can root entire teams for a guaranteed 2 seconds. Since the correct response to poke and siege is to force an engage, that's a very powerful tool. If it had a short cooldown, his opponents would be left with option 1 --- get poked down -- and option 2 -- waste cooldowns trying to force an engage, then get poked down. That is to say, no choice at all.
By contrast, Ashe's ult is not a great disengage tool, and while it is a strong engage tool, it's also relatively slow/easy to dodge (compared to, say, jinx/ez ult), incredibly hard to hit at long ranges, and hard countered by banshee's or qss.
Sivir, MF, Kalista, Urgot and Jhin have 120 second rank 1 ult cooldowns. So does Ez, but it's reduced by Q's. Luc and Draven's are 110 seconds. Ashe, Graves, Trist, and Vayne are 100 seconds. Jinx, Cait, and Twitch are 90s. Corki, Kog, and Quinn can't be compared; Kindred doesn't go bot. Her ult is on the shorter side, sure, but not crazily out of line like you're making it out to be.
I'm not one to call for a gutting because a particular champion has a high winrate. But I think just nerfing her ult CD and leaving everything the same would be reasonable for Ashe mains similar to Irelia's recent nerfs.
I agree with you that Ashe is too strong right now and deserves a nerf (though ofc I don't want to see her gutted). I disagree that her ult cooldown is the place to do it.