I have been having issues getting the network tools to work in ModelBuilder, things are not consistently validating and some tools like Set Attribute Value are not validating in ModelBuilder at all.
USE CASE: ModelBuilder is a great tool for building simple workflows that requite multiple tools, for example: disable network, add a field and then set it as a network attribute, and enable again.
Also, if you can get model builder parameter validation working right, it will work well from anywhere! 🙂