I'm going to rank the types based on their offensive presence in the current metagame, let's see if I got it right.

>You'd better not be weak to this tier
Flying

>Top tier
Rock, Fire, Ice

>High tier
Ground, Ghost, Water, Fighting

>Mid tier
Dark, Electric, Dragon

>Low tier
Steel, Fairy
>Bottom tier
Psychic, Grass, Bug

>Who gives a damn? tier
Poison, Normal