Greetings, @meno. I'm looking forward to watching this movie. I love Malek's work. He's a hell of an actor. The negative criticism I have read has to do with a sort of appologetic tone regarding Mercury's flaws. As if the movie tries too hard to whitewash his reputation.
Historical accuracy or biases are ubicuous in biopics. I would look for other cinematic elements to judge whether the movies is good or not.