Comparing intensifiers
很 - very
真 - really
挺 - pretty
非常 - >= very, &lt; extremely
相当 - quite
极为 - extremely
太 -  too


These words are describing a 'level'.
挺 = 蛮 = 比较 &lt; 很 &lt;= 非常 = 特别 &lt; 极为

太 is somehow special, means it is much more than you expected.

鞋太大：The shoes are larger than your size, regardless of whether your feet are large or small.

I'm answering this question by my sense as a native Chinese speaker.

蛮 is not that commonly or widely used in north China. (but people all can understand), maybe southern Chinese prefer to use it. And I believe it is widely used in Taiwan.