Yeah I never understood the negative stigma associated with using Marketplace assets for a released game. Oftentimes 99% of the audience does not even know the Marketplace even exists, let alone which assets come from it.
If the asset fits, then use it… Who cares if someone says “I saw those rocks on sale on the asset store!” or “I saw that skeleton in another game!” .
I mean imagine if people said the same thing about actors - " since I saw him in Star Wars he better not be in Indiana Jones!"