Well to begin with these dlcs were like this because they wanted to introduce old campaigns. I would rather see new campaigns.

Why anyone would want to see a return of the korath baffles me they were one of the worst species in galactic civilizations 2. My guess you want someone who could do poorly. For playing I thought they were underpowered. 

As far as the drath the concept worked better than practise. They were great at starting wars just not fighting them. Having a war profiteering instigator was a good idea to spice up the game just have to make them better tacticians. Why the drath why not, have a new race who are instigating ear profiteers. 

This is a little deeper than that. As far as I can see bugs in the game that people are mentioning are getting fixed just not, on everyone timeframe. People were complaining that they were making dlcs instead of fixing bugs when in actuality they were it just takes time, sothis was interpreted as the reason we got badreviews is because of dlcs