MDL is lightweight and easy to use. It uses paper elements which lets developers use only a part of the framework if they do not wish to change entire code. For example if you want to add just MDL graph, you can use without using other material design components in your website.
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To get started, Google is also offering few templates. You can use these templates to see how to use this framework.
If you are into web design field, it is recommend to check this new material design library and try it. Use of Material design will increase over the time and it could become next big framework for web designers.
Source: Introducing Material Design Lite [Google]