Syndra main here.
The nerfs were just right imo. If people still find her strong, well, it should be looked into, definitely. But it would be an issue of overpoweredness, not brokenness.
The issue with the 6.9 update was the passive effect for W (W5 from now on for convenience). Essentially, before the update, Syndra worked like this:
- Is target in kill range(~80%HP, no MR and no barrier)? If no, poke till they are. If yes, move to number 2.
- Q
- Q
- Is target in stun range/ will they be in the next 3 seconds? If no, go back to n3. If yes, move to n4.
- W first sphere quick before it expires.
- Q
- Have you got crazy amounts of cdr (like, 45%) or 35% and fucking godlike timing? If no, move to n8. If yes, move to n9.
- You now have ~3 seconds to pull off a 6 spheres ult. If you can't, move to number 1 and start all over.
- Q, move to n10.
- You now have 0.5 seconds to pull off a 7 spheres ult. If you can't, move to number 11.
- You now have 1 second to pull off a 6 spheres ult. If you can't, move to number 1 and start all over again.
You can clearly see how it works: You ramp up, you blow someone up or not, and you fall back down. You ramp up again, blow someone up or not, and fall back down. You work with windows of opportunity, which as you can see don't last all that much.
This is how Syndra worked after the update:
- Have you got W5? If yes, move to n3. If no, move to n2.
- Are you a dumbass FotM Syndra player with no skill that still manages to oneshot people because of Syndra being broken? If no, act like before the mage update. If yes, remember to uninstall when you're done playing this match. Meanwhile, farm till you get W5. then move to n3.
- Q
- Q
- Q
- WW
- Is target in stun range? If yes, move to n8. If no, move to n6.
- E
- Q
- You now have 8 seconds to pull of a 7 spheres ult. If you can't, move to n6.
- R
- WW
13.~~ Are you shit at Syndra? If no, act normal. If yes, wait for ult to come back up and repeat.~~
The problem here is clear: you press Q a lot, mindlessly spam W5 to reset all the spheres, press R. You ramp up and you never fall back down. This is incredibly toxic for the game, as anyone who has played against Syndra recently knows. Not you mention the HUGE AoE stun you get from those three spheres you can pick up.
Now, after the nerf, Syndra is back to the original play pattern, only you have ~2 seconds longer window of opportunity to pull of ults. I personally find this questionable but one could argue that it's something that makes her stronger/easier without modifying how she plays drastically; it's also easier to balance- just change the numbers on her Q5.
EDIT: MFW People downvoting without bothering to point out why I'm wrong/why they disagree with me. Yay thanks.