You say this, yet the stats speak for themselves. Yet regardless of winrate, pros, and people who follow them should be able to acknowledge this. Especially since they got analysts doing this data collection for them.
You can list all those strengths, (and leave out the glaring weaknesses) but in the end, Riot did the job and lobotomized him.
Q harass => Have fun running out of mana for all ins/trades
W Activated => Look at all the ranged, mobile, tops that have migrated from other places because Riot bi-weekly nerfing sprees.
"power of his Ult" => You mean the ult where he loses stats to be able to resist the knock-up community in the name of "Meaningful choices" and "Counterplay"?
Alone, his kit might have actually been good, but this is the mobility meta. Ghost, Ghostblade, and Furor boots won't help him here.
EDIT: If he ever gets strong again (I believe he will), it will be because of the eventual nerfs that every champion will receive. You've seen it before (if you've been playing from previous seasons) and you'll see it again. Champions come and go, metas change, things change. But what's left behind are broken kits and null functional champions who have to rise once again only to be nerfed again until they're nothing.
Those champs may have been gimmicky, annoying, OP. But what Riot does? Doesn't fix any problem, it just shifts it, breaking other champs.