Aatrox went from auto attacking diver to spell combo skirmisher

It pretty much makes sense why a lot of people don't like Aatrox's new kit, especially if they mained him. This isn't a "similar champion", this is a complete change of a champion. The new Aatrox has no AS modifiers at all, a complete shift from a character based around auto attack people to death with above average attack range.

It's not like old Aatrox's kit isn't a viable kit like Poppy, Galio, Urgot, or Yorick. Right now you can see that Aatrox is decent statistically. Even if you played a game against or as Aatrox right now, you'd feel like you were actually playing the game and not some gimmick. His old kit has gameplay that both players can play around. Landing his Q and E and playing around the 3 hit passive. Then you get to all-in people by surprising them with your ult for the finishing blows.

New Aatrox has absolutely no 3 hit passive. They've already lost what made old Aatrox unique, the choice between damage or healing.

New Aatrox has absolutely no attack speed buffs. They could at least change the bonus AD on his E to AD, and maybe even reduce his passive cooldown by a small amount for basic attacks on champions.

New Aatrox's ult just looks underwhelming. You gain size, but do you gain aatack range for that gain in size? How much aatack range? You increase damage, but that forced you to start fights with the ult, which would be the same for Old Aatrox, except while in lane. (Moving during Revive is pretty sick actually, just doesn't feel as cool as Massacre did.)

Poppy stayed a tank. Galio stayed an AP tank. Yorick stayed a minion-mancer. Urgot stayed a tank-semi range champion with lock-on mechanics. Aatrox didn't stay an attack speed slasher diver and lost everything that made him Aatrox kit-wise. This is just a new champion with a Revive and the name Aatrox, not a rework.