The topic of tier lists will always be conteintious within the FGC, but some do it quite well, and two men who are usually quite measured in their take on tier lists are Evo winner, AngryBird, and Red Bull Kumite winner, Big Bird.
The two have released their second tier list for Street Fighter 6 which they discussed on their last stream.
As usual, the Birds don't consider any character as 'D' or anything like that. So, the lowest rating they give is usually a 'B.'
In their first tier list, they had Luke as the best character in the game followed by Guile and then Juri. They also placed JP in the tier below Luke as they felt he had some weaknesses that made it impossible for him to be at the top. Considering their tier list back then was made in July, two months on, their thoughts on the game has changed.