Hello, stalkyy
If you think that hunters have low damage, then you can write a bug-report about it. But you need to know what is the ability of the hunter doesn't work properly.
Test spells, find a bug, compare it with formula of damage from http://www.wowhead.com/ .
P. S Don't write "My character has low damage, fix it!". If you realy want that hunters will be fixed, write problems and bugs of this class in a detail.
Some links for writing bug-reports, if you need it:
Bug tracker
The rules of writing.