From what I saw last week on my way to the 10 credits, mono Piranas were quite a popular choice. Parmabarb has proven to be a very handy 2*, without which they're brought back a peg. It's quite normal for strong-but-(debatably) not-ban-worthy characters to be voted out just to reduce the frequency of that week's overplayed clans.
Parmabarb ban is justifiable; he is a very commonly used card and I could understand how he would be frustrating to play against. When he is banned I use Amiral Coco instead, who is very effective against any +/- attack clan
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