State of Sona

This is coming from a Gold support main (or maybe not anymore, but I still play a lot of support games).

Sona has 58.5% winrate across all elos according to leagueofgraphs and champion.gg. While this may seem very high and op, I think she is right where she should be, it's other ("classic") supports that feel underwhelming.

When was the last time you said "we need to kill the support first"? I bet it was one of those Soraka games before she got nerfed. In almost every game since season 3 after a lost fight you see someone saying "wtf, don't focus support, we lost that fight because of that". And usually it is correct - supports are the lowest priority targets. They are walking warding bots who press every other fight and provide a little bit of soft or hard CC and shield for about 200 in a meta where tanks die in 3 seconds. In a 4v5 you have highest chances to win a fight when your afk is support.

Now you are probably thinking: but wait, for example are very useful! They provide great initiations and CC! Sure, but once the fight starts they are reduced to what I described, they are the last target you ever want to focus unless they are literally on top of you. Also many non-support champions provide good initiation: to name a few.

Now, there are champions that are very close to where they should be, they are fun to play but underpowered

TL;DR Sona is balanced, other supports are weak. Until people start considering focusing supports in fights they are little more than glorified walking sightstones.