Mostly people that didn't play/like old scarner like u can say they like the rework.
He just lost a lot of his feeling. Playing him feels wierd and a bit like a new champ, and for me it isn't very statisfying.
I mostly played him as ap-bruiser top, but as ap-toplaner he sufferd alot from that rework as he lost dps and tankiness and didn't gain anything in return.
Since i never liked him in the jungle, Scarner prettymuch died for me with the removed heal and lower dps on E.
As a jungler he does well now, but only after the first few buffs.
directly after the rework, he just sucked.
Also about that karma rework, new karma needed quite alot off buffs to become viable so the complains right after the rework were justyfied, and even now, she's just a new champ that has nothing in common with the old Karma.
The few people that liked old Karma lost a champ, the rest gained one.