Every number is Russ’s own rating out of 10. Russ has previously stated that he never scores in sponsored videos, so the food he reviews carries no applied pressure or bias.
Pretty good; beats Maccas and Hungry Jack's beef burgers, a bit below Betty's Burgers
Square-patty bacon cheeseburger with mayo and tomato sauce. Russ loved the crispy bacon and said it beats Maccas and Hungry Jack's, though Betty's is a bit better. The '8.5 out of 10' he mentions is a score he read elsewhere, not his own rating.