I'm sorry many of you are having a tough time. Although I have spent some embarrassing money on this game, I have used droids since day 1 and they don't require money, just some time to gear up. It is easy to finish all tiers taking little damage with droids. I Used HK (L), IG88, IG86, R2D2, B2. Aside from R2D2 who is modded for extreme speed (over 250), none of my droids are very fast. HK runs at 145 speed, B2 at 126, and the IGs are between 160 and 180. TM gain from HK lead is key to victory.
Obviously this doesn't help people who didn't invest in droids but they have their uses; they are extremely good in GW and there now have been multiple events that allowed the use of droids. Just saying for those struggling, droids are not hard at all to farm and if you don't have B2 or R2D2, sub in some empire toons. One day I swear they will get a cleanser. Maybe BB8 "Thumbs Up" will be a cleanse move for droids.