Droids are definitely falling behind these days. Maybe next month, or the one after, the devs will rework separatists and/or droids?
Also, if anyone is interested, I made my own rework for General Grievous and IG-100 Magnaguard. Currently they're both terrible (100 is arguable) but they should be really good, especially Grievous, so I made a rework for them on how I think they should be. Maybe if my posts get popular enough the devs will rework him like in my reworks :) My reworks have really nice synergy between them too, which is great because that's how they should be.
IG-100: https://forums.galaxy-of-heroes.starwars.ea.com/discussion/93059/ig-100-magnaguard-rework-idea
Grievous: https://forums.galaxy-of-heroes.starwars.ea.com/discussion/88065/general-grievous-rework-idea-updated/p1
And also, I use droids in my arena and get top 5 every day usually. The only teams i can't beat are Chaze (i win very rarely) and Zaul teams, so if your arena has a lot of those then I'm sorry about that, I feel your pain :(