Oh god... my worst weakness...choices! Well let's see:
really came through with getting an identity from a Schwarzenegger parody to a an actual cool undead champ. Outside of that though he still needs a good story of his life. Gameplay wise his abilities are good. Q is telegraphed but rewarding when you get the small knockup, even more at full, E is good W is nice and ult is fun (even if hard to control).
was vastly improved! still kept her iconic dash but added some new things for an interesting tank. Characterwise she's ok in my book.
I'm kinda mixed on. On the one hand, he's fun and really good late game. On the other, current meta is all about fast games so he doesn't do jack in this. I think his kit is OK at least for the enchanter feel but I don't get that feel of building a bunch of armor like old Taric did, which I feel some are upset over. Characterwise I don't really like him but I don't despise him. I just don't find him that interesting (targon's champs outside of Sol and Diana are just bland to me)
FUCK YES! One of the best reworks I've seen and played! Hits the feel of minion master without making it complex, great splitpusher, design is good, and I actually like playing him. Lorewise I haven't read up on, but what I have read is pretty good. He's one of the few champs that before I never would of touched ever but now is one of my favorites.
Oh...this guy. Ok gameplay I feel was vastly cleaned up from just anti-mage mage to anti-mage tank, which I liked a lot more, but characterwise and many people will also say this, he got destroyed/replaced. He went from a wise sorrowful sentry to a blubbering jock of a statue. I really didn't like that change.
Ryze I really can't comment too much on. His backstory now is ok i guess but I don't find interest in it and gameplay is just... well, insert ryze needs another rework joke here. I just don't find this guy to be balanceable as he is, even after what feels like his 5 rework even though it's his 3rd(?). He just has a lot of power in his kit and either he's really strong or needs nerf and really weak. At this point I'm fairly certain that he's just a balance nightmare unless they go all out and completely change thing in his kit, which in turn would destroy the character a bit but that's the only thing I see working for him in the future.
since his rework he's only been touched up on for bugs. That to me tells me that his rework is fairly good if he doesn't need any buffs or nerfs after a rework release. In fact this might be the only champ to have that done so far. Lorewise I like the change. The whole man hunter bounty hunter theme really wasn't that great in his old lore, so changing it to a horror movie stalking manmade werewolf on the streets was a nice change.
Like Yorick, he's one of those champs that I never would touch before their rework but now I love them. His shotgun knees are very fun for me to use. Q is a little lack luster, mostly I use it for waveclear, E is ok for getting the opposite legs, W is nice and ult is so satisfying when you drag them in. Lorewise I love it. Having the whole survive pain for true strength is a good motive for a character like this.
On a whole, if I have to choose its really close but it comes down to and . WW was just teh perfect example of a modernization of a champ and Sion is just an old favorite of mine that has really rewarding abilities to land either fully charged Q or ult.
Worst rework is because reasons up above and close to that is because like I said I hate his character now.
& 
's relaunch was so bad that she isn't even considered on the list.