[quote=ViKtoricus]
What are the differences between low to high tier characters?Like, how powerful is high tier and how weak is low tier?
[/quote]

The Character sheet more or less reveals the differences in detail, but the main differences usually amount to the amount of destructive power a character is capable of. 

Low tier would be say batman, Robin, Punisher. Average badass humans more or less. 

While High would be in the realm of Doctor Manhattan, Captain Marvel, Superman, and fully enraged Hulk.