Thief isnt a melee class. it can simply melee as an option.
The point is that melee combat in general is a death-trap and it's much more viable for the classes which are even tooled specifically for high-dps output melee to simply stay at range. Viz. it is wiser for any conservative or tactical player to always stay at range, doing damage with a gun or shortbow. Viz. melee is quite useless in comparison; there is no need or convincing reason to use it (other than the fact you simply get bored of spamming the same 2/3 shortbow skills, and want some self-imposed variation and challenge).
I've not had any extended runs on the game, it's all been little periods at a time, so It's taken me longer to grasp than it normally would/should. 
looks like Cjs came good and if they didn't we have an official response that says it will be sorted. I don't know where Cjs get their keys as they were delivered keys so all odd but glad it appears to be resolved.