So, I already know that they don't want to change building speed of units and i get that, the more complex unit is the more time and resources it requires. However, the key characteristic of a unit was speed, but because so many players didn't like that it so slow devs decided to make speed basically redundant (only like 1/3 of uses for speed). So, the speed is not so important as it was previously. I know that there are special unit in termes of ability like Xenobiology that allows for the flying monster from Matrix to destroy other Scouts, also the artillery unit that has 100 attack and 380 380 500 400 defence that shoots 1 more time before destruction. Maybe, introduce even more unique abilities for other units, if Devs don't want to change characterstics of other units. Maybe add some other new mechanics to the game to make units even more unique and interesting. I mean the Protector that has 15 attack 30 30 30 30 defence in Troops has terribly large amount of resources for it's small defence points and slow build time (the worst unit in the game), maybe add to it some special ability in the battle for it. Basically, my suggestion is just to make bad units to be more unique and specialized. There are some units that are just waaayy better than other unit and I think that's a little bit unfair, to amke it fair add some mechanics or special abilities that it will be using in battle to turn the tide of the battle. That's basically it, I mean I really love this game, but it's just that some units really ... make it hard to love it even more. 

If you don't know what units needs to be changed, here is a hint.  The Troops (60 Attack 12 12 8 8 Defence,  75 Attack 14 14 14 14 Defence,  15 Attack 30 30 30 30 Defence), the motor corps. (360 Attack  30 40 40 40 Defence), Aviation (1440 Attack  144 43 43 144 Defence,  1680 Attack  144 43 43 144 Defence, 900 Attack  100 100 100 100 Defence). They need buff, I'm from Russian server Red Zero which is way it's hard for me write names, I know I can lookup them in the wiki, but the stats should easily make them recognizable. Thank you!