I think both Sorins are rather well balanced, together with the three mana Yideon. They're sufficiently threatening that their presence is felt and they turn their respective decks into well-oiled machines once they drop
and it doesn't feel as if they are one-card-do-all engines.
Biggest problem with 'wankers is is the 5 mana ones are pretty much "kill on sight or it takes over the game". At least the good ones, there's lots of chaff you can get in preconstructed decks. A lot of designs tend to pile up way too many functions on one card
- card draw engine, removal, win condition. While on principle I don't have a problem with cards that must be answered, the problem is with the lack of answer cards.
Only now is removal starting to catch up with them being so plentiful (see the recent printings of Eliminate, Scorching Dragonfire, Storm's Wrath and Pestilent Haze, a lot of removal starts to treat them on par with creatures,
which is what they should have done around War of the Spark).
That said, I always detested the entire superfriends archetype. While I begrudgingly accept after all these years there's no coming back and 'wankers are here to stay, a whole deck where you just throw the lot of them together
feels like it's robbing them of their special flavor.
In a similar vein, I fail to understand the reasoning behind the recent-ish 'wanker rules change which lets you put five Chandras on board, as long as each has a different moniker. I've seen other cards do it much more elegantly,
for example Legend of Five Rings used to recognize that named heroes represented on different cards are the same guy at different stages of their life, with different level of experience. This could be represented in MtG, for example, if you could play
a more expensive chandra over the cheaper version to get a cost discount and/or some extra loyalty, though that would probably break the game unless carefully worded.
I really liked the 'wankers in Origins, they had this "hero's journey" type of feel:
https://www.cardhoarder.com/magic-origins-cheatsheet