Yeah - all that glitters is not gold and as such asset store solutions might not always work as flawless as intended. When talking about Unity there is some truth to a discussion that came up in their forums after the UE4 announcements. UE4 sort of has become a service while Unity is a product you buy. In order to make a new version attractive there have to be new features. This of course sometimes leads to some half-baked stuff. That's a rather general problem though while the service idea behind the UE4 subscription creates a stronger focus on aspects like bugfixing and refining the features that are already there...

UE4's new licensing model in my opinion is the next big thing after Unity with its free version which had quite an impact on the entire industry back then. We'll probably see other engines offering similar subscription offers...