This is just objectively untrue, and I say it as someone who has in the past been frustrated by people who just vent or outright troll. The vast, vast majority of people who frequent this place still overall enjoy their products and have been constructive in their criticisms when giving them. This place would've never had absolute monster threads discussing to the most minute details and often just gushing over individual characters if it was anywhere close to as "toxic" as it has been irrevocably labeled.
Sorry, but I have to disagree with you. This place becomes overwhelmingly negative leading up to and after a game launch. ME:A is half a year away still, and you could already see the vitriol surging, even before they announced the forum closure.
Furthermore, many of the people who are now claiming that this is being done to censor their constructive criticism are actually some of the worst repeat offenders here. Unfortunately, they don't see their behavior as a problem, and therefore they will never learn to behave.