I hesitate to "complain" about what is truly a wonderful asset library, however I would agree that they are both over-saturated and too dark in many cases.
I often have to revert to sketchup trees so I can control the color. It seems no matter what tree I pick they are all the same saturated / dark color. Particularly for street trees around a building and for site drawings like attached they need to be much lighter which many are in reality. It seems no matter what tree in the asset library I pick it has the same dark almost kelly green. The front row of trees in this image are SKP trees. There are 6-7 varieties of the enscape tree beyond. I personally really need more variety (particularly lighter) so I have to revert to proxies / skp when I would prefer not to. I am working on a diagramatic site aerial where I placed all Enscape trees and now I regret it as they are too dark and I can not control short of p-shop I guess.