Hello,
I am a support main, so I'd like to share my thoughts on this as someone who plays a variety of support styles.
**What I don't like: **
The auras are indeed overlooked too often. The main thing that bugs me is that it's difficult to keep up with where the aura ends. I have to hover over my ability to see the range of it, but my adcs can't see it with me, so it negates any kind of interaction between the two players. Think of it this way: A player knows how to interact with Thresh's lantern because he/she sees that it is clickable. If there was a way to make the range visible to both Sona and nearby allies, sort of like how Morgana's ultimate range is visible to both her and those affected, I think that issue would be resolved.Perhaps not permanently display the range, as that would make positioning a bit too easy in respects to champion zones imo, but maybe once in a while or when she switches auras? It would prompt more awareness of what each aura's utility is.
I also agree with some of the previous posts that it'd be nice if we could visually see the effects of power cord.
**What I do like: **
Sona's Q does marvelous damage if you've got the build for it. Even after it was nerfed, the new support items allow for more aggressive rune and mastery builds on her, and it's great poke/harass if you know when the right time to trade is. (Not so much when you're out of position and going too ham, resulting in a massive hp drop)
Sona is a great champion to play with someone who isn't particularly comfortable with the adc role. Her bonus damage helps with CSing and trading, her heal allows for recuperation and resistance, and her speed up helps in chases and escapes. I once heard someone refer to Sona as a "nursing" champion, who gives a lot of room for mistakes on the adc's behalf.
**
Decisions to consider: **
One of Sona's greatest decisions is when she should go in an harass, and which aura is best suited for this harass.
Other considerations include which mana regen item to buy, because heaven knows she cannot just spam QWE all day long or she'll end up useless. Also, which gold item to buy. If I'm supporting an experienced adc, I will go for the spellthief, because the trades will be good. But if I'm with a passive or more inexperienced adc, I'll take the gold coin, and make sure I nurse them. (coughireallydontlikepassiveadcscough)
**Play Making: **
Right now I main Annie support. And I have to say I am in love with the "FLASH ULT! DANCE MY PUPPETS!" approach. My two most fun poke lanes are Annie and Sona for that very reason.
Also, I love building Iceborn Gauntlet on her. Not sure if it's considered a "play," but it does have a surprise factor ("wtf a Sona with iceborn gauntlet?" <-- I get that all the time). Since she has nice cooldowns, by late game I have enough mana regen and cdr from unholy grail to continually spam and slow enemies.
So that took me a while to answer, but there's my honest opinion! Hope to hear more about possible improvements on her!