I kept quiet. I decided bitching was too tiresome / nobody was getting anything done, nobody was getting better by having complainants flung at them.
After I established relationships with various folks across the groups, I had folks from every team come to me / were available to me in ways they never would for each other.
My job was 2x easier as far as getting help / information / cooperation compared to the folks complaining non stop.
There were groups I agreed with / disagreed with (one group was straight wrong about nearly everything), but throwing a fit just made for worse relationships.
I still made suggestions to folks whose job it was to manage these groups, politely, gently, often quietly, but if they did or did not fix it / repeating myself wasn't a big focus for me.
I've long since given up on right and wrong (well outside real moral issues) and more about how to get to the end as best as possible with the relationships / people available.