Leia nerfed?

Leia wasn't nerfed, it's just that Ahsoka was doubly buffed with Ezra now always being on that team and there are some buffs to Ahsoka's kit as well

Nerf 'had a hard life on the streets' Ezra on Ahsoka teams?

Oh my, inc third nerf to Rey.  GLAT unexpectedly gets her abilities from Rey as long as GLAT is in your roster.  Hobo Ezra’s fault.  This is why you lost.  

- total Joke and sarcasm - 

Once again, there are many varying factors we don't know here - modding, relic levels, datacrons, and zetas/omicrons. So you shouldn't expect people to just nod their heads without the proper knowledge.

Happened to me 2 or 3 times in 3vs3 when Drogan got killed very quickly because of a strong DC and there was then no chance to get a revive. Just bad luck I guess. Wouldn't the game be boring when eyery counter would be a 100% win?

I doubt it. 

Mods, turn order, randomly focussing one of your key toons first -- there are ways it can happen. It's also a more difficult counter to execute in 3v3. 

I mean, it's always possible that a recent update introduced a bug, but Leia's a GL and has been out a long time. There's no reason for a nerf. There's been no news of a nerf. 

Best guess is that things just went wrong this one time. but if you want, you can test the squad in Arena before the next GAC round starts.