As I said above, I consider the actual nerf to be mostly a non-issue, However, everything surrounding it is the real issue: from Plarium's failure to test causing the issue to telling CCs to not tell players a nerf was coming to waiting until after the Summon Rush began to announce. Those are the real problems. Anyone who spent money on shards to pull for the SR before the nerf announcement has very good reason to be upset.
I lost a veteran player from my clan last night over it. He was pissed off about it on Friday, but from his chat comments, I thought he was just gonna skip the Fusion. However, he left the clan yesterday with no warning, so I assume he quit the game over it.
I have another player who announced Saturday that he would probably be quitting the game after the fiasco of this fusion. He has not actually quit yet, so time will tell on him. He is one of the biggest spenders in my clan, and definitely not a player Plarium would want to lose.
IMO, Maria, alone, is not what is causing these reactions. Maria is merely the final straw....
Will Plarium finally learn the lessons? Unlikely.