I think one of the problems with Syndra is that she should be a harder champion to play and was pretty difficult on release but now she just feels like R = Win.
They should rework her ultimate in some way that allows for better skill expression. Right now the only skillful thing you can do with the ultimate is use E afterwards. Like her ultimate is pretty much a copy of Veigar's ultimate, only difference is that you gotta cast Q a few times before using it.
Also it's pretty lame thematically. Her Q is more intense in my opinion. Summoning a energy thingy out of no where causing an explosion vs hurling those things at a target. Maybe they could try exploring the telekinesis vibes Syndra kinda gives off more. A lot of champions need changes, I wish Riot would just stop making new stuff and put all their resources on fixing the older stuff.