I don't know why you would ever watch twitch tv for anything - only hipsters with bad taste and over-estrogened yetis with a penchant for unwrapping electronic cards in an alcohol-infused haze stream on that service.
Because you can't mute a sperglord streamer and his/her terrible music to just watch the gameplay to figure out whether or not the game is worth buying? You do know the entire review process of these gaming publication sites are corrupt as hell? Many Studio's give money to lolkotaku/lolpolygon for positive reviews.
You can't trust any of those publications to put out a balanced review. Look at lolpolygons review of Bayonetta, they deducted points because of boobs and how attractive the character was basically. There was another review from VG247 where the writer who thought they were reviewing uncharted 4 was actually playing uncharted 2 and was slamming the game. There are many instances of incompetence at all of those sites.
One studio even tried to give free games and a console to Total Biscuit in hopes to bribe a good review from him in the past.