More unique classe can be added by mods or developer over time. The developer also mention he is working on adding Character Traits so unique traits for the races is another option.
But human and halfkin is the "standard" you should compare other races with. Starting with unique powerful races is a cheat you chose to use, if you get them from the game with random stat rolls and at great expense that would be more fair.
I would prefer if there was more variation particularly from the fighters guild. Why do they seem to NEVER ask for weapons? or armor? or anything other than "clear out this location" / "kill X of this enemy".
Because it's the "Fighting" Guild not the Crafting Guild.