This is the reaction of many fans to every release of a new Magic: The Gathering set. Even a single card, to many, can spell the doom of the game - witness the reactions to Tarmogoyf, Remand, and Umezawa's Jitte, to name a few prominent examples. Keep in mind that a new set is released every three months; that each year brings a new block (meaning cards from the previous block are no longer relevant in block-format tournaments or drafting); and that Wizards of the Coast has made a Banned/Restricted list for cards that break the game too hard. Even when Wizards brings back old cards, fans will decry some choices as being The End of MtG - even though they didn't break the game the first time around.
Champions of the Galaxy is a very small press game with a very...dedicated and invested...fanbase, many of whom have been playing for twenty years. A recent move from B&W cards to full colour has ruined it forever.
Cardfight!! Vanguard: Because this game's fanbase is heavily composed of former Yu-Gi-Oh! players who griped at the aforementioned volume of abusable combos, they can be incredibly paranoid about any newly-revealed card being too good. Cue cries of "OMG GOLD PALADINS ARE GETTING TOO MUCH SUPPORT!" "OMG THAT'S BROKEN!" "WHY DO YOU DO THIS TO US?". Specific examples include:
Blazing Lion, Platina Ezel: at first, fans were enraged by this supposed game-breaker powering up all rear-guards. Then they realized how difficult it would be to meet the required conditions.
Bad End Dragger: With the Spike Brothers already having an overkill combo, this card appeared to be making said combo even more obnoxiously unstoppable... Until you realize that Spike Brothers also happen to have poor defensive capabilities, and would need to hang in longer if they have any hope of lasting long enough to pull it off.
This has practically become a Vicious Cycle at this point. Eradicator, Vowing Saber Dragon "Reverse"? Game RUINED FOREVER. Lock and Link Joker in general? Game RUINED FOREVER. Star-vader, Chaos Breaker Dragon? Game RUINED FOREVER.
As far as the anime's concerned, the reveal of Psyqualia had many fans who enjoyed the anime for not following the more usual supernatural powers route calling Ruined Forever. Season 2 got much the same reaction.