I agree with you on all the stat stuff Varang. Just with regard to Gith though, That at least can be explained by the fact that it makes sense the queen would send Gith that speak common to try and find the artefact. They probably could have done more to give them an alien, unique accent but creating a new accent is difficult to do and keep consistent, and can too easily end up silly rather than cool, so I can't quite blame them for not going that route.
I appreciate the stuff they did do, though. The flavorful words sprinkled throughout. Ghaik. Kainyank. Istik. Etc.