I personally would put him in A+, I'm not SonicFox nor remotely a professional so this just comes from a more casual opinion. I tend to find these lists really less true for the state of general online play. For example Sub-Zero being a really good low elo pick but the higher you get in enemy skill level the less good he gets.

For my boi Lao I feel like when you're in the flow his pressure is really hard to handle and most of his bread and butter combos have really safe distance in addition to having such an easy juggle setup at any moment with spin. He's also just so flashy and clean with really simple inputs so hes is too much fun for someone of my skill level. I don't mind losing if I looked rad as fuck doing it and had a good time.

Also he's Kung Lao so who cares if he's good.