There have been a few flaws as to design expectations of few of the assets that makes it way into the marketplace and as usual its a guess on the part of the author as well as Epic to figure out as customers what it is that we expect and want in a working asset.
Instead of barking after the fact here is a few items I expect and feel free to add.
Scale set to real world use.
If a mountain it should be scaled to the same size expected as being a mountain and not a mole hill.
Collision warped to the asset with the expectation that a player will either walk on it or climb it
Available documentation as to full asset usage.