I had a roommate from Mongolia who disliked beer with carbonation. I never understood the full story of why but he said it was better flat. He would show up with a sixpack, dispense half each can into Gatorade bottles, then shake them and leave them out for a few hours to go completely flat.
The carbonation in Guinness is a blend of CO2 and Nitrogen which creates the different bubbles. Some beers are carbonated in different ways and have a different feeling.
My father when he was younger knew a brewery owner who before bed each night would pop open a fresh beer and set it on his night stand, then when he woke up in the morning drank and enjoyed his flat room temperature beer. Apparently did it every day for atleast 40 years.
The carbonation in Guinness is a blend of CO2 and Nitrogen which creates the different bubbles. Some beers are carbonated in different ways and have a different feeling.