This nerf was a bad move by EA. I am one of those who bought Barris and she was very usefull in the beginning, so I do not regret buying her. With her on her team we have been able to progress faster than ftp players and have been able to get the other better characters as well as lvl'ing up the rest of the team. The problem with Barris is that she stagnates and becomes progressivly less useful when the rest of the team grows. Thus:
Stage 1: in the beginning she (and doku) is OP! <- most ftp players are still here and their anger is understandable
Stage 2: she is still usefull (I still use her), but your team has grown strong enough to shut her down when she defends (no longer OP)
Stage 3a: You have gotten the best characters (that you can lvl without packs), given them max gear and max lvl. Since you can't lvl Barris. She has become irrelevant compaired to the rest of your team.
Stage 3b: Have spent millions on this game and max lvl'd all the pack characters. You will never find Barris on these teams because she is a joke compaired to the best pack character even without synergies.
Lastly the reason EA made a mistake is that we now know that the strongest buyable characters today, could be nerfed to oblivion tomorrow. Investing huge amounts in a pack with superstrong characters is no longer worth the gamble. Nerfs like this is good for game balance, but terrible for selling characters. imagine if they did the same with gems (nerf their value by doubling all the costs)